diff --git a/calligraphy.cabal b/calligraphy.cabal
index f449392..3937ee6 100644
--- a/calligraphy.cabal
+++ b/calligraphy.cabal
@@ -39,6 +39,13 @@ library
   hs-source-dirs:  src
   other-modules:   Paths_calligraphy
   autogen-modules: Paths_calligraphy
+  data-dir:        data
+  data-files:
+    js/d3.v7.min.js
+    js/main.css
+    js/main.js
+    js/treegraph.js
+
   exposed-modules:
     Calligraphy
     Calligraphy.Compat.Debug
@@ -57,10 +64,13 @@ library
     Calligraphy.Util.Types
 
   build-depends:
+    , aeson
     , array
+    , bytestring
     , containers
     , directory
     , enummapset
+    , file-embed
     , filepath
     , ghc
     , mtl
diff --git a/js/d3.v7.min.js b/js/d3.v7.min.js
new file mode 100644
index 0000000..1efed2d
--- /dev/null
+++ b/js/d3.v7.min.js
@@ -0,0 +1,2 @@
+// https://d3js.org v7.4.4 Copyright 2010-2022 Mike Bostock
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c=a-a%3,f=u+(t+1)%3,s=c+(a+2)%3,l=n[o],h=n[t],d=n[f],p=n[s];if(au(r[2*l],r[2*l+1],r[2*h],r[2*h+1],r[2*d],r[2*d+1],r[2*p],r[2*p+1])){n[t]=p,n[a]=l;const r=e[s];if(-1===r){let n=this._hullStart;do{if(this._hullTri[n]===s){this._hullTri[n]=t;break}n=this._hullPrev[n]}while(n!==this._hullStart)}this._link(t,r),this._link(a,e[o]),this._link(o,s);const u=c+(a+1)%3;i<ru.length&&(ru[i++]=u)}else{if(0===i)break;t=ru[--i]}}return o}_link(t,n){this._halfedges[t]=n,-1!==n&&(this._halfedges[n]=t)}_addTriangle(t,n,e,r,i,o){const a=this.trianglesLen;return this._triangles[a]=t,this._triangles[a+1]=n,this._triangles[a+2]=e,this._link(a,r),this._link(a+1,i),this._link(a+2,o),this.trianglesLen+=3,a}}function ou(t,n,e,r){const i=t-e,o=n-r;return i*i+o*o}function au(t,n,e,r,i,o,a,u){const c=t-a,f=n-u,s=e-a,l=r-u,h=i-a,d=o-u,p=s*s+l*l,g=h*h+d*d;return c*(l*g-p*d)-f*(s*g-p*h)+(c*c+f*f)*(s*d-l*h)<0}function uu(t,n,e,r,i,o){const a=e-t,u=r-n,c=i-t,f=o-n,s=a*a+u*u,l=c*c+f*f,h=.5/(a*f-u*c),d=(f*s-u*l)*h,p=(a*l-c*s)*h;return d*d+p*p}function cu(t,n,e,r){if(r-e<=20)for(let i=e+1;i<=r;i++){const r=t[i],o=n[r];let a=i-1;for(;a>=e&&n[t[a]]>o;)t[a+1]=t[a--];t[a+1]=r}else{let i=e+1,o=r;fu(t,e+r>>1,i),n[t[e]]>n[t[r]]&&fu(t,e,r),n[t[i]]>n[t[r]]&&fu(t,i,r),n[t[e]]>n[t[i]]&&fu(t,e,i);const a=t[i],u=n[a];for(;;){do{i++}while(n[t[i]]<u);do{o--}while(n[t[o]]>u);if(o<i)break;fu(t,i,o)}t[e+1]=t[o],t[o]=a,r-i+1>=o-e?(cu(t,n,i,r),cu(t,n,e,o-1)):(cu(t,n,e,o-1),cu(t,n,i,r))}}function fu(t,n,e){const r=t[n];t[n]=t[e],t[e]=r}function su(t){return t[0]}function lu(t){return t[1]}const hu=1e-6;class du{constructor(){this._x0=this._y0=this._x1=this._y1=null,this._=""}moveTo(t,n){this._+=`M${this._x0=this._x1=+t},${this._y0=this._y1=+n}`}closePath(){null!==this._x1&&(this._x1=this._x0,this._y1=this._y0,this._+="Z")}lineTo(t,n){this._+=`L${this._x1=+t},${this._y1=+n}`}arc(t,n,e){const r=(t=+t)+(e=+e),i=n=+n;if(e<0)throw new Error("negative radius");null===this._x1?this._+=`M${r},${i}`:(Math.abs(this._x1-r)>hu||Math.abs(this._y1-i)>hu)&&(this._+="L"+r+","+i),e&&(this._+=`A${e},${e},0,1,1,${t-e},${n}A${e},${e},0,1,1,${this._x1=r},${this._y1=i}`)}rect(t,n,e,r){this._+=`M${this._x0=this._x1=+t},${this._y0=this._y1=+n}h${+e}v${+r}h${-e}Z`}value(){return this._||null}}class pu{constructor(){this._=[]}moveTo(t,n){this._.push([t,n])}closePath(){this._.push(this._[0].slice())}lineTo(t,n){this._.push([t,n])}value(){return this._.length?this._:null}}class gu{constructor(t,[n,e,r,i]=[0,0,960,500]){if(!((r=+r)>=(n=+n)&&(i=+i)>=(e=+e)))throw new Error("invalid bounds");this.delaunay=t,this._circumcenters=new Float64Array(2*t.points.length),this.vectors=new Float64Array(2*t.points.length),this.xmax=r,this.xmin=n,this.ymax=i,this.ymin=e,this._init()}update(){return this.delaunay.update(),this._init(),this}_init(){const{delaunay:{points:t,hull:n,triangles:e},vectors:r}=this,i=this.circumcenters=this._circumcenters.subarray(0,e.length/3*2);for(let n,r,o=0,a=0,u=e.length;o<u;o+=3,a+=2){const u=2*e[o],c=2*e[o+1],f=2*e[o+2],s=t[u],l=t[u+1],h=t[c],d=t[c+1],p=t[f],g=t[f+1],y=h-s,v=d-l,_=p-s,b=g-l,m=2*(y*b-v*_);if(Math.abs(m)<1e-9){let i=1e9;const o=2*e[0];i*=Math.sign((t[o]-s)*b-(t[o+1]-l)*_),n=(s+p)/2-i*b,r=(l+g)/2+i*_}else{const t=1/m,e=y*y+v*v,i=_*_+b*b;n=s+(b*e-v*i)*t,r=l+(y*i-_*e)*t}i[a]=n,i[a+1]=r}let o,a,u,c=n[n.length-1],f=4*c,s=t[2*c],l=t[2*c+1];r.fill(0);for(let e=0;e<n.length;++e)c=n[e],o=f,a=s,u=l,f=4*c,s=t[2*c],l=t[2*c+1],r[o+2]=r[f]=u-l,r[o+3]=r[f+1]=s-a}render(t){const n=null==t?t=new du:void 0,{delaunay:{halfedges:e,inedges:r,hull:i},circumcenters:o,vectors:a}=this;if(i.length<=1)return null;for(let n=0,r=e.length;n<r;++n){const r=e[n];if(r<n)continue;const i=2*Math.floor(n/3),a=2*Math.floor(r/3),u=o[i],c=o[i+1],f=o[a],s=o[a+1];this._renderSegment(u,c,f,s,t)}let u,c=i[i.length-1];for(let n=0;n<i.length;++n){u=c,c=i[n];const e=2*Math.floor(r[c]/3),f=o[e],s=o[e+1],l=4*u,h=this._project(f,s,a[l+2],a[l+3]);h&&this._renderSegment(f,s,h[0],h[1],t)}return n&&n.value()}renderBounds(t){const n=null==t?t=new du:void 0;return t.rect(this.xmin,this.ymin,this.xmax-this.xmin,this.ymax-this.ymin),n&&n.value()}renderCell(t,n){const e=null==n?n=new du:void 0,r=this._clip(t);if(null===r||!r.length)return;n.moveTo(r[0],r[1]);let i=r.length;for(;r[0]===r[i-2]&&r[1]===r[i-1]&&i>1;)i-=2;for(let t=2;t<i;t+=2)r[t]===r[t-2]&&r[t+1]===r[t-1]||n.lineTo(r[t],r[t+1]);return n.closePath(),e&&e.value()}*cellPolygons(){const{delaunay:{points:t}}=this;for(let n=0,e=t.length/2;n<e;++n){const t=this.cellPolygon(n);t&&(t.index=n,yield t)}}cellPolygon(t){const n=new pu;return this.renderCell(t,n),n.value()}_renderSegment(t,n,e,r,i){let o;const a=this._regioncode(t,n),u=this._regioncode(e,r);0===a&&0===u?(i.moveTo(t,n),i.lineTo(e,r)):(o=this._clipSegment(t,n,e,r,a,u))&&(i.moveTo(o[0],o[1]),i.lineTo(o[2],o[3]))}contains(t,n,e){return(n=+n)==n&&(e=+e)==e&&this.delaunay._step(t,n,e)===t}*neighbors(t){const n=this._clip(t);if(n)for(const e of this.delaunay.neighbors(t)){const t=this._clip(e);if(t)t:for(let r=0,i=n.length;r<i;r+=2)for(let o=0,a=t.length;o<a;o+=2)if(n[r]==t[o]&&n[r+1]==t[o+1]&&n[(r+2)%i]==t[(o+a-2)%a]&&n[(r+3)%i]==t[(o+a-1)%a]){yield e;break t}}}_cell(t){const{circumcenters:n,delaunay:{inedges:e,halfedges:r,triangles:i}}=this,o=e[t];if(-1===o)return null;const a=[];let u=o;do{const e=Math.floor(u/3);if(a.push(n[2*e],n[2*e+1]),u=u%3==2?u-2:u+1,i[u]!==t)break;u=r[u]}while(u!==o&&-1!==u);return a}_clip(t){if(0===t&&1===this.delaunay.hull.length)return[this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax,this.xmin,this.ymin];const n=this._cell(t);if(null===n)return null;const{vectors:e}=this,r=4*t;return e[r]||e[r+1]?this._clipInfinite(t,n,e[r],e[r+1],e[r+2],e[r+3]):this._clipFinite(t,n)}_clipFinite(t,n){const e=n.length;let r,i,o,a,u=null,c=n[e-2],f=n[e-1],s=this._regioncode(c,f),l=0;for(let h=0;h<e;h+=2)if(r=c,i=f,c=n[h],f=n[h+1],o=s,s=this._regioncode(c,f),0===o&&0===s)a=l,l=0,u?u.push(c,f):u=[c,f];else{let n,e,h,d,p;if(0===o){if(null===(n=this._clipSegment(r,i,c,f,o,s)))continue;[e,h,d,p]=n}else{if(null===(n=this._clipSegment(c,f,r,i,s,o)))continue;[d,p,e,h]=n,a=l,l=this._edgecode(e,h),a&&l&&this._edge(t,a,l,u,u.length),u?u.push(e,h):u=[e,h]}a=l,l=this._edgecode(d,p),a&&l&&this._edge(t,a,l,u,u.length),u?u.push(d,p):u=[d,p]}if(u)a=l,l=this._edgecode(u[0],u[1]),a&&l&&this._edge(t,a,l,u,u.length);else if(this.contains(t,(this.xmin+this.xmax)/2,(this.ymin+this.ymax)/2))return[this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax,this.xmin,this.ymin];return u}_clipSegment(t,n,e,r,i,o){for(;;){if(0===i&&0===o)return[t,n,e,r];if(i&o)return null;let a,u,c=i||o;8&c?(a=t+(e-t)*(this.ymax-n)/(r-n),u=this.ymax):4&c?(a=t+(e-t)*(this.ymin-n)/(r-n),u=this.ymin):2&c?(u=n+(r-n)*(this.xmax-t)/(e-t),a=this.xmax):(u=n+(r-n)*(this.xmin-t)/(e-t),a=this.xmin),i?(t=a,n=u,i=this._regioncode(t,n)):(e=a,r=u,o=this._regioncode(e,r))}}_clipInfinite(t,n,e,r,i,o){let a,u=Array.from(n);if((a=this._project(u[0],u[1],e,r))&&u.unshift(a[0],a[1]),(a=this._project(u[u.length-2],u[u.length-1],i,o))&&u.push(a[0],a[1]),u=this._clipFinite(t,u))for(let n,e=0,r=u.length,i=this._edgecode(u[r-2],u[r-1]);e<r;e+=2)n=i,i=this._edgecode(u[e],u[e+1]),n&&i&&(e=this._edge(t,n,i,u,e),r=u.length);else this.contains(t,(this.xmin+this.xmax)/2,(this.ymin+this.ymax)/2)&&(u=[this.xmin,this.ymin,this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax]);return u}_edge(t,n,e,r,i){for(;n!==e;){let e,o;switch(n){case 5:n=4;continue;case 4:n=6,e=this.xmax,o=this.ymin;break;case 6:n=2;continue;case 2:n=10,e=this.xmax,o=this.ymax;break;case 10:n=8;continue;case 8:n=9,e=this.xmin,o=this.ymax;break;case 9:n=1;continue;case 1:n=5,e=this.xmin,o=this.ymin}r[i]===e&&r[i+1]===o||!this.contains(t,e,o)||(r.splice(i,0,e,o),i+=2)}if(r.length>4)for(let t=0;t<r.length;t+=2){const n=(t+2)%r.length,e=(t+4)%r.length;(r[t]===r[n]&&r[n]===r[e]||r[t+1]===r[n+1]&&r[n+1]===r[e+1])&&(r.splice(n,2),t-=2)}return i}_project(t,n,e,r){let i,o,a,u=1/0;if(r<0){if(n<=this.ymin)return null;(i=(this.ymin-n)/r)<u&&(a=this.ymin,o=t+(u=i)*e)}else if(r>0){if(n>=this.ymax)return null;(i=(this.ymax-n)/r)<u&&(a=this.ymax,o=t+(u=i)*e)}if(e>0){if(t>=this.xmax)return null;(i=(this.xmax-t)/e)<u&&(o=this.xmax,a=n+(u=i)*r)}else if(e<0){if(t<=this.xmin)return null;(i=(this.xmin-t)/e)<u&&(o=this.xmin,a=n+(u=i)*r)}return[o,a]}_edgecode(t,n){return(t===this.xmin?1:t===this.xmax?2:0)|(n===this.ymin?4:n===this.ymax?8:0)}_regioncode(t,n){return(t<this.xmin?1:t>this.xmax?2:0)|(n<this.ymin?4:n>this.ymax?8:0)}}const yu=2*Math.PI,vu=Math.pow;function _u(t){return t[0]}function bu(t){return t[1]}function mu(t,n,e){return[t+Math.sin(t+n)*e,n+Math.cos(t-n)*e]}class xu{static from(t,n=_u,e=bu,r){return new xu("length"in t?function(t,n,e,r){const i=t.length,o=new Float64Array(2*i);for(let a=0;a<i;++a){const i=t[a];o[2*a]=n.call(r,i,a,t),o[2*a+1]=e.call(r,i,a,t)}return o}(t,n,e,r):Float64Array.from(function*(t,n,e,r){let i=0;for(const o of t)yield n.call(r,o,i,t),yield e.call(r,o,i,t),++i}(t,n,e,r)))}constructor(t){this._delaunator=new iu(t),this.inedges=new Int32Array(t.length/2),this._hullIndex=new Int32Array(t.length/2),this.points=this._delaunator.coords,this._init()}update(){return this._delaunator.update(),this._init(),this}_init(){const t=this._delaunator,n=this.points;if(t.hull&&t.hull.length>2&&function(t){const{triangles:n,coords:e}=t;for(let t=0;t<n.length;t+=3){const r=2*n[t],i=2*n[t+1],o=2*n[t+2];if((e[o]-e[r])*(e[i+1]-e[r+1])-(e[i]-e[r])*(e[o+1]-e[r+1])>1e-10)return!1}return!0}(t)){this.collinear=Int32Array.from({length:n.length/2},((t,n)=>n)).sort(((t,e)=>n[2*t]-n[2*e]||n[2*t+1]-n[2*e+1]));const t=this.collinear[0],e=this.collinear[this.collinear.length-1],r=[n[2*t],n[2*t+1],n[2*e],n[2*e+1]],i=1e-8*Math.hypot(r[3]-r[1],r[2]-r[0]);for(let t=0,e=n.length/2;t<e;++t){const e=mu(n[2*t],n[2*t+1],i);n[2*t]=e[0],n[2*t+1]=e[1]}this._delaunator=new iu(n)}else delete this.collinear;const e=this.halfedges=this._delaunator.halfedges,r=this.hull=this._delaunator.hull,i=this.triangles=this._delaunator.triangles,o=this.inedges.fill(-1),a=this._hullIndex.fill(-1);for(let t=0,n=e.length;t<n;++t){const n=i[t%3==2?t-2:t+1];-1!==e[t]&&-1!==o[n]||(o[n]=t)}for(let t=0,n=r.length;t<n;++t)a[r[t]]=t;r.length<=2&&r.length>0&&(this.triangles=new Int32Array(3).fill(-1),this.halfedges=new 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Pm{constructor(t){this._context=t}lineStart(){this._point=0}lineEnd(){}point(t,n){if(t=+t,n=+n,0==this._point++)this._x0=t,this._y0=n;else{const e=Nm(this._x0,this._y0),r=Nm(this._x0,this._y0=(this._y0+n)/2),i=Nm(t,this._y0),o=Nm(t,n);this._context.moveTo(...e),this._context.bezierCurveTo(...r,...i,...o)}}}function zm(t){return new Cm(t,!0)}function Dm(t){return new Cm(t,!1)}function Rm(t){return new Pm(t)}function Fm(t){return t.source}function qm(t){return t.target}function Om(t){let n=Fm,e=qm,r=vm,i=_m,o=null,a=null;function u(){let u;const c=dm.call(arguments),f=n.apply(this,c),s=e.apply(this,c);if(null==o&&(a=t(u=wa())),a.lineStart(),c[0]=f,a.point(+r.apply(this,c),+i.apply(this,c)),c[0]=s,a.point(+r.apply(this,c),+i.apply(this,c)),a.lineEnd(),u)return a=null,u+""||null}return u.source=function(t){return arguments.length?(n=t,u):n},u.target=function(t){return arguments.length?(e=t,u):e},u.x=function(t){return arguments.length?(r="function"==typeof 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t===h?y:t},y.clickDistance=function(t){return arguments.length?(p=(t=+t)*t,y):Math.sqrt(p)},y.tapDistance=function(t){return arguments.length?(g=+t,y):g},y},t.zoomIdentity=tw,t.zoomTransform=nw,Object.defineProperty(t,"__esModule",{value:!0})}));
diff --git a/js/main.css b/js/main.css
new file mode 100644
index 0000000..ccf9119
--- /dev/null
+++ b/js/main.css
@@ -0,0 +1,12 @@
+html, body {
+  margin: 0;
+  padding: 0;
+}
+html, body {
+  background: #fff;
+}
+@media (prefers-color-scheme: dark) {
+  html, body {
+    background: #111;
+  }
+}
diff --git a/js/main.js b/js/main.js
new file mode 100644
index 0000000..f9f6ab1
--- /dev/null
+++ b/js/main.js
@@ -0,0 +1,15 @@
+const input = document.getElementById('treegraph-json').innerText;
+const data = JSON.parse(input);
+const svg = drawTreeGraph(data.tree, {
+  children : datum => datum.children,
+  label : datum => datum.name,
+  width : document.body.clientWidth,
+  calls : data.calls,
+  types : data.types,
+});
+d3.select("#download").on("click", function() {
+  const content = svg.outerHTML;
+  const href = 'data:application/octet-stream;base64,' + btoa(content);
+  d3.select(this).attr("href", href).attr("download", "calligraphy.svg")
+})
+document.getElementById('view').appendChild(svg);
diff --git a/js/treegraph.js b/js/treegraph.js
new file mode 100644
index 0000000..367ab46
--- /dev/null
+++ b/js/treegraph.js
@@ -0,0 +1,418 @@
+const drawTreeGraph = (function() {
+  const gradientPath = (function() {
+    class Path {
+      constructor(_) {
+        this._ = _;
+        this._m = undefined;
+      }
+      moveTo(x, y) {
+        this._ = [];
+        this._m = [ x, y ];
+      }
+      lineTo(x, y) { this._.push(new Line(this._m, this._m = [ x, y ])); }
+      bezierCurveTo(ax, ay, bx, by, x, y) {
+        this._.push(new BezierCurve(this._m, [ ax, ay ], [ bx, by ],
+                                    this._m = [ x, y ]));
+      }
+      * split(k = 0) {
+        const n = this._.length;
+        const i = Math.floor(n / 2);
+        const j = Math.ceil(n / 2);
+        const a = new Path(this._.slice(0, i));
+        const b = new Path(this._.slice(j));
+        if (i !== j) {
+          const [ab, ba] = this._[i].split();
+          a._.push(ab);
+          b._.unshift(ba);
+        }
+        if (k > 1) {
+          yield* a.split(k - 1);
+          yield* b.split(k - 1);
+        } else {
+          yield a;
+          yield b;
+        }
+      }
+      toString() { return this._.join(""); }
+    }
+    class Line {
+      constructor(a, b) {
+        this.a = a;
+        this.b = b;
+      }
+      split() {
+        const {a, b} = this;
+        const m = [ (a[0] + b[0]) / 2, (a[1] + b[1]) / 2 ];
+        return [ new Line(a, m), new Line(m, b) ];
+      }
+      toString() { return `M${this.a}L${this.b}`; }
+    }
+    const BezierCurve = (function() {
+      const l1 = [ 4 / 8, 4 / 8, 0 / 8, 0 / 8 ];
+      const l2 = [ 2 / 8, 4 / 8, 2 / 8, 0 / 8 ];
+      const l3 = [ 1 / 8, 3 / 8, 3 / 8, 1 / 8 ];
+      const r1 = [ 0 / 8, 2 / 8, 4 / 8, 2 / 8 ];
+      const r2 = [ 0 / 8, 0 / 8, 4 / 8, 4 / 8 ];
+
+      function dot([ ka, kb, kc, kd ], {a, b, c, d}) {
+        return [
+          ka * a[0] + kb * b[0] + kc * c[0] + kd * d[0],
+          ka * a[1] + kb * b[1] + kc * c[1] + kd * d[1]
+        ];
+      }
+
+      return class BezierCurve {
+        constructor(a, b, c, d) {
+          this.a = a;
+          this.b = b;
+          this.c = c;
+          this.d = d;
+        }
+        split() {
+          const m = dot(l3, this);
+          return [
+            new BezierCurve(this.a, dot(l1, this), dot(l2, this), m),
+            new BezierCurve(m, dot(r1, this), dot(r2, this), this.d)
+          ];
+        }
+        toString() { return `M${this.a}C${this.b},${this.c},${this.d}`; }
+      };
+    })();
+    const line = d3.line().curve(d3.curveBundle).x(d => d.y).y(d => d.x);
+    return ([ source, target ]) => {
+      const p = new Path;
+      line.context(p)(source.path(target));
+      return p;
+    };
+  })();
+  const addLinks = (root, edges, incoming, outgoing) => {
+    incoming = incoming || 'incoming';
+    outgoing = outgoing || 'outgoing';
+    const map = new Map(root.descendants().map(d => [d.data.key, d]));
+    root.descendants().forEach(d => {
+      d[incoming] = [];
+      d[outgoing] = [];
+    })
+    for (const edge of edges) {
+      const from = map.get(edge.source);
+      const to = map.get(edge.target);
+      from[outgoing].push([ from, to ])
+    }
+    root.descendants().forEach(
+        d => { d[outgoing].forEach(o => { o[1][incoming].push(o); }); });
+    return root;
+  };
+
+  // draw hierarchical links between nodes
+  const drawTreeLinks = (svg, root, cfg) => {
+    const {stroke, strokeOpacity, strokeLinejoin, strokeLinecap, strokeWidth} =
+        cfg;
+    svg.append("g")
+        .attr("fill", "none")
+        .attr("stroke", stroke)
+        .attr("stroke-opacity", strokeOpacity)
+        .attr("stroke-linecap", strokeLinecap)
+        .attr("stroke-linejoin", strokeLinejoin)
+        .attr("stroke-width", strokeWidth)
+        .selectAll("path")
+        .data(root.links())
+        .join("path")
+        .attr("d", d3.linkHorizontal().x(d => d.y).y(d => d.x));
+  };
+
+  // draw non-hierarchical links between arbitrary nodes
+  const drawLinks = (svg, root, outgoing, {color, strokeOpacity}) => {
+    const k = 6;
+    return svg.append("g")
+        .attr("stroke-opacity", strokeOpacity)
+        .attr("fill", "none")
+        .selectAll("path")
+        .data(d3.transpose(root.descendants()
+                               .flatMap(d => d[outgoing].map(gradientPath))
+                               .map(path => Array.from(path.split(k)))))
+        .join("path")
+        .style("mix-blend-mode", "darken")
+        .attr("stroke", (d, i) => color(i / ((1 << k) - 1)))
+        .attr("d", d => d.join(""));
+  };
+  const drawSimpleLinks =
+      (svg, root, outgoing, {stroke, strokeOpacity}) => {
+        // the x and y coords are transposed here
+        // because we want the tree depth to grow to the right
+        const line = d3.line().curve(d3.curveBundle).x(d => d.y).y(d => d.x);
+        return svg.append("g")
+            .attr("stroke", stroke)
+            .attr("stroke-opacity", strokeOpacity)
+            .attr("fill", "none")
+            .selectAll("path")
+            .data(root.descendants().flatMap(d => d[outgoing]))
+            .join("path")
+            .attr("d", ([ from, to ]) => line(from.path(to)));
+      }
+
+  const drawNode = (svg, root, cfg) => {
+    const {
+      color,
+      r,
+      labels,
+      halo,
+      haloWidth,
+      stroke,
+      fill,
+      selected,
+      deselected
+    } = cfg;
+    const node = svg.append("g")
+                     .selectAll("a")
+                     .data(root.descendants())
+                     .join("a")
+                     .attr("transform", d => `translate(${d.y},${d.x})`);
+    const shapeOf = d => d.data.tag === 'module'         ? 'ring'
+                         : d.data.type === 'data'        ? 'rect'
+                         : d.data.type === 'constructor' ? 'triangle'
+                         : d.data.type === 'record'      ? 'left-triangle'
+                         : d.data.type === 'type-class'  ? 'star'
+                         : d.data.type === 'value'       ? 'circle'
+                                                         : 'circle';
+    const fillColor = d => {
+      const color = d.children ? stroke : fill;
+      d.color = color;
+      return color
+    };
+
+    node.append("rect")
+        .filter(d => shapeOf(d) === 'rect')
+        .attr('width', 2 * r)
+        .attr('height', 2 * r)
+        .attr('x', -r)
+        .attr('y', -r)
+        .attr("fill", fillColor)
+        .each(function(d) { d.shape = this; })
+
+    const triangle = d3.line()([ [ 0, -r ], [ -r, r ], [ r, r ] ]);
+    const leftTriangle = d3.line()([ [ -r, 0 ], [ r, -r ], [ r, r ] ]);
+
+    node.append("path")
+        .filter(d => shapeOf(d) === 'triangle')
+        .attr('d', triangle)
+        .attr("fill", fillColor)
+        .each(function(d) { d.shape = this; })
+    node.append("path")
+        .filter(d => shapeOf(d) === 'left-triangle')
+        .attr('d', leftTriangle)
+        .attr("fill", fillColor)
+        .each(function(d) { d.shape = this; })
+    const r1 = r * 1.5;
+    const r2 = r1 * 6 / 15;
+    const star = d3.radialLine()([
+      [ 0, r1 ], [ Math.PI * 0.2, r2 ], [ Math.PI * 0.4, r1 ],
+      [ Math.PI * 0.6, r2 ], [ Math.PI * 0.8, r1 ], [ Math.PI * 1, r2 ],
+      [ Math.PI * 1.2, r1 ], [ Math.PI * 1.4, r2 ], [ Math.PI * 1.6, r1 ],
+      [ Math.PI * 1.8, r2 ], [ Math.PI * 2, r1 ]
+    ]);
+    node.append("path")
+        .filter(d => shapeOf(d) === 'star')
+        .attr('d', star)
+        .attr("fill", fillColor)
+        .each(function(d) { d.shape = this; })
+
+    node.append("circle")
+        .filter(d => shapeOf(d) === 'ring')
+        .attr("fill", "none")
+        .attr("stroke", fillColor)
+        .each(function(d) { d.shape = this; })
+        .attr("r", r);
+
+    node.append("circle")
+        .filter(d => shapeOf(d) === 'circle')
+        .attr("fill", fillColor)
+        .each(function(d) { d.shape = this; })
+        .attr("r", r);
+
+    node.append("text")
+        .attr("fill", color)
+        .attr("dy", "0.32em")
+        .attr("x", d => d.children ? -6 : 6)
+        .attr("text-anchor", d => d.children ? "end" : "start")
+        .attr("paint-order", "stroke")
+        .attr("stroke", halo)
+        .attr("stroke-width", haloWidth)
+        .each(function(d) { d.text = this; })
+        .on("mouseover", selected)
+        .on("mouseout", deselected)
+        .text((d, i) => labels[i]);
+    return node;
+  };
+
+  function selected(event, d) {
+    const strokeOpacity = 0.4;
+    d3.select(this).attr("font-weight", "bold");
+    d3.selectAll(d.incoming.map(d => d.path))
+        .attr("stroke", "red")
+        .attr("stroke-opacity", strokeOpacity)
+        .attr("stroke-width", 2)
+        .raise();
+    d3.selectAll(d.incoming.map(([ d ]) => d.shape)).attr("fill", "red")
+    d3.selectAll(d.incoming.map(([ d ]) => d.text)).attr("font-weight", "bold");
+    d3.selectAll(d.outgoing.map(d => d.path))
+        .attr("stroke", "green")
+        .attr("stroke-opacity", strokeOpacity)
+        .attr("stroke-width", 2)
+        .raise();
+    d3.selectAll(d.outgoing.map(([, d ]) => d.shape)).attr("fill", "green")
+    d3.selectAll(d.outgoing.map(([, d ]) => d.text))
+        .attr("font-weight", "bold");
+
+    d3.selectAll(d.intype.map(d => d.typePath))
+        .attr("stroke", "magenta")
+        .attr("stroke-opacity", strokeOpacity)
+        .attr("stroke-width", 2)
+        .raise();
+    d3.selectAll(d.intype.map(([ d ]) => d.shape)).attr("fill", "magenta")
+    d3.selectAll(d.intype.map(([ d ]) => d.text)).attr("font-weight", "bold");
+    d3.selectAll(d.outtype.map(d => d.typePath))
+        .attr("stroke", "cyan")
+        .attr("stroke-opacity", strokeOpacity)
+        .attr("stroke-width", 2)
+        .raise();
+    d3.selectAll(d.outtype.map(([, d ]) => d.shape)).attr("fill", "cyan")
+    d3.selectAll(d.outtype.map(([, d ]) => d.text)).attr("font-weight", "bold");
+  }
+
+  const deselected = (color) => {
+    return function(event, d) {
+      const setFill = d => d.color;
+      d3.select(this).attr("font-weight", null);
+      d3.selectAll(d.incoming.map(d => d.path))
+          .attr("stroke", null)
+          .attr("stroke-opacity", 0.2)
+          .attr("stroke-width", null);
+      d3.selectAll(d.incoming.map(([ d ]) => d.shape)).attr("fill", setFill)
+      d3.selectAll(d.incoming.map(([ d ]) => d.text)).attr("font-weight", null);
+      d3.selectAll(d.outgoing.map(d => d.path))
+          .attr("stroke", null)
+          .attr("stroke-opacity", 0.2)
+          .attr("stroke-width", null);
+      d3.selectAll(d.outgoing.map(([, d ]) => d.shape)).attr("fill", setFill)
+      d3.selectAll(d.outgoing.map(([, d ]) => d.text))
+          .attr("font-weight", null);
+      d3.selectAll(d.intype.map(d => d.typePath))
+          .attr("stroke", null)
+          .attr("stroke-opacity", 0.2)
+          .attr("stroke-width", null);
+      d3.selectAll(d.intype.map(([ d ]) => d.shape)).attr("fill", setFill)
+      d3.selectAll(d.intype.map(([ d ]) => d.text)).attr("font-weight", null);
+      d3.selectAll(d.outtype.map(d => d.typePath))
+          .attr("stroke", null)
+          .attr("stroke-opacity", 0.2)
+          .attr("stroke-width", null);
+      d3.selectAll(d.outtype.map(([, d ]) => d.shape)).attr("fill", setFill)
+      d3.selectAll(d.outtype.map(([, d ]) => d.text)).attr("font-weight", null);
+    };
+  };
+
+  // compute tree layout
+  const layoutTree = (root, {height, width, padding}) => {
+    const dx = 10;
+    const dy = width / (root.height + padding);
+    const tree = d3.tree().nodeSize([ dx, dy ])(root);
+
+    // Center the tree.
+    let x0 = Infinity;
+    let x1 = -x0;
+    root.each(d => {
+      if (d.x > x1)
+        x1 = d.x;
+      if (d.x < x0)
+        x0 = d.x;
+    });
+
+    // Compute the default height.
+    if (height === undefined) {
+      height = x1 - x0 + dx * 2;
+    }
+    return {w : width, h : height, dx, dy, x0, x1, tree};
+  };
+
+  return function drawTreeGraph(data, {
+    children,
+    calls,
+    types,
+    label,
+    width = 640,
+    height,
+    r = 3,
+    padding = 1,
+    strokeWidth = 2,
+    strokeOpacity = 0.05,
+    strokeLinejoin,
+    strokeLinecap,
+    light = {
+      color : "#000",
+      fill : "#999",
+      stroke : "#555",
+      halo : "#fff",
+    },
+    dark = {
+      color : "#fff",
+      fill : "#bbb",
+      stroke : "#777",
+      halo : "#000",
+    },
+    haloWidth = 1,
+  } = {}) {
+    let colors = light;
+    if (window.matchMedia &&
+        window.matchMedia('(prefers-color-scheme: dark)').matches) {
+      colors = dark;
+    }
+    const {color, fill, stroke, halo} = colors;
+    const root = addLinks(addLinks(d3.hierarchy(data, children), calls), types,
+                          'intype', 'outtype');
+
+    const labels = root.descendants().map(d => label(d.data, d));
+    const {dx, dy, w, h, x0} = layoutTree(root, {width, height, padding});
+
+    const svg =
+        d3.create("svg")
+            .attr("xmlns", "http://www.w3.org/2000/svg")
+            .attr("viewBox", [ -dy * padding / 2, x0 - dx, w, h ])
+            .attr("width", w)
+            .attr("height", h)
+            .attr("style", "max-width: 100%; height: auto; height: intrinsic;")
+            .attr("font-family", "sans-serif")
+            .attr("font-size", 10);
+    drawTreeLinks(
+        svg, root,
+        {stroke, strokeOpacity, strokeLinejoin, strokeLinecap, strokeWidth})
+
+    drawLinks(svg, root, 'outgoing', {
+      color : d3.interpolateHsl("red", "green"),
+      strokeOpacity : 0.3,
+    })
+    drawSimpleLinks(svg, root, 'outgoing', {
+      stroke : "steelblue",
+      strokeOpacity : 0.0,
+    }).each(function(d) { d.path = this; })
+    drawLinks(svg, root, 'outtype', {
+      color : d3.interpolateHsl("magenta", "cyan"),
+      strokeOpacity : 0.3,
+    })
+    drawSimpleLinks(svg, root, 'outtype', {
+      stroke : "orange",
+      strokeOpacity : 0.0,
+    }).each(function(d) { d.typePath = this; })
+    drawNode(svg, root, {
+      r,
+      color,
+      labels,
+      halo,
+      haloWidth,
+      stroke,
+      fill,
+      selected,
+      deselected : deselected(color)
+    })
+    return svg.node();
+  };
+})();
diff --git a/src/Calligraphy.hs b/src/Calligraphy.hs
index 5069ad6..a226977 100644
--- a/src/Calligraphy.hs
+++ b/src/Calligraphy.hs
@@ -1,5 +1,8 @@
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE TemplateHaskell #-}
 
 module Calligraphy (main, mainWithConfig) where
 
@@ -12,17 +15,26 @@ import Calligraphy.Phases.Parse
 import Calligraphy.Phases.Render
 import Calligraphy.Phases.Search
 import Calligraphy.Util.Printer
-import Calligraphy.Util.Types (ppCallGraph)
+import Calligraphy.Util.Types (CallGraph (CallGraph), Key (Key), encodeModuleTree, moduleTree, ppCallGraph)
 import Control.Monad.RWS
-import Data.Text (Text)
+import qualified Data.Aeson as Aeson
+import Data.ByteString (ByteString)
+import Data.ByteString.Builder (Builder)
+import qualified Data.ByteString.Builder as Builder
+import qualified Data.ByteString.Lazy as Lazy
+import Data.FileEmbed (embedFile)
+import Data.Foldable (toList)
+import Data.String (fromString)
 import qualified Data.Text as T
 import qualified Data.Text.IO as Text
+import Data.Tuple (swap)
 import Data.Version (showVersion)
+import GHC.Generics (Generic)
 import Options.Applicative
 import Paths_calligraphy (version)
 import System.Directory (findExecutable)
 import System.Exit
-import System.IO (stderr)
+import System.IO (IOMode (WriteMode), stderr, withFile)
 import System.Process
 
 main :: IO ()
@@ -56,9 +68,8 @@ mainWithConfig AppConfig {..} = do
   debug dumpFinal $ ppCallGraph cgCleaned
 
   let renderConfig' = renderConfig {clusterModules = clusterModules renderConfig && not (collapseModules nodeFilterConfig)}
-      txt = runPrinter $ render renderConfig' cgCleaned
 
-  output outputConfig txt
+  output outputConfig renderConfig' cgCleaned
 
 data AppConfig = AppConfig
   { searchConfig :: SearchConfig,
@@ -86,15 +97,76 @@ pConfig =
     <*> pOutputConfig
     <*> pDebugConfig
 
-output :: OutputConfig -> Text -> IO ()
-output cfg@OutputConfig {..} txt = do
+data JSONInfo = JSONInfo
+  { _jsonTree :: ParsePhaseDebugInfo,
+    _jsonGraph :: CallGraph
+  }
+  deriving (Generic)
+
+d3Script :: ByteString
+d3Script = $(embedFile "js/d3.v7.min.js")
+
+treegraphScript :: ByteString
+treegraphScript = $(embedFile "js/treegraph.js")
+
+mainCSS :: ByteString
+mainCSS = $(embedFile "js/main.css")
+
+mainScript :: ByteString
+mainScript = $(embedFile "js/main.js")
+
+htmlScript :: Lazy.ByteString -> Builder
+htmlScript json =
+  unlinesBuilder $
+    [ Builder.byteString "<!doctype html>",
+      Builder.byteString "<html>",
+      Builder.byteString "<head>",
+      Builder.byteString "<meta charset=\"utf8\">",
+      Builder.byteString "<style>" <> Builder.byteString mainCSS <> Builder.byteString "</style>",
+      Builder.byteString "<script>" <> Builder.byteString d3Script <> Builder.byteString "</script>",
+      Builder.byteString "<script>" <> Builder.byteString treegraphScript <> Builder.byteString "</script>",
+      Builder.byteString "<script type=\"application/json\" id=\"treegraph-json\">" <> Builder.lazyByteString json <> Builder.byteString "</script>",
+      Builder.byteString "</head>",
+      Builder.byteString "<body>",
+      Builder.byteString "<div id=\"view\"></div>",
+      Builder.byteString "<a id=\"download\" href=\"#\">Download SVG</a>",
+      Builder.byteString "<script>" <> Builder.byteString mainScript <> "</script>",
+      Builder.byteString "</body>",
+      Builder.byteString "</html>"
+    ]
+  where
+    unlinesBuilder xs = mconcat (fmap (\a -> a <> Builder.charUtf8 '\n') xs)
+
+encodeCallGraph :: CallGraph -> Aeson.Value
+encodeCallGraph graph@(CallGraph _ calls' types') =
+  let encodeEdge (Key source, Key target) =
+        Aeson.object
+          [ (fromString "source", Aeson.toJSON source),
+            (fromString "target", Aeson.toJSON target)
+          ]
+      tree = encodeModuleTree $ moduleTree graph
+      calls = Aeson.toJSON $ fmap (encodeEdge . swap) $ toList calls'
+      types = Aeson.toJSON $ fmap (encodeEdge . swap) $ toList types'
+   in Aeson.object
+        [ (fromString "tree", tree),
+          (fromString "calls", calls),
+          (fromString "types", types)
+        ]
+
+output :: OutputConfig -> RenderConfig -> CallGraph -> IO ()
+output cfg@OutputConfig {..} renderConfig' graph = do
   unless (hasOutput cfg) $ Text.hPutStrLn stderr "Warning: no output options specified, run with --help to see options"
   forM_ outputDotPath $ \fp -> Text.writeFile fp txt
   forM_ outputPngPath $ \fp -> runDot ["-Tpng", "-o", fp]
   forM_ outputSvgPath $ \fp -> runDot ["-Tsvg", "-o", fp]
+  forM_ outputJsonPath $ \fp -> Aeson.encodeFile fp json
+  forM_ outputHtmlPath $ \fp -> withFile fp WriteMode $ \f ->
+    Builder.hPutBuilder f (htmlScript $ Aeson.encode json)
   when outputStdout $ Text.putStrLn txt
   where
-    hasOutput (OutputConfig Nothing Nothing Nothing _ False) = False
+    txt = runPrinter $ render renderConfig' graph
+    json = encodeCallGraph graph
+    hasOutput (OutputConfig Nothing Nothing Nothing Nothing Nothing _ False) = False
     hasOutput _ = True
 
     runDot flags = do
@@ -112,6 +184,8 @@ data OutputConfig = OutputConfig
   { outputDotPath :: Maybe FilePath,
     outputPngPath :: Maybe FilePath,
     outputSvgPath :: Maybe FilePath,
+    outputHtmlPath :: Maybe FilePath,
+    outputJsonPath :: Maybe FilePath,
     outputEngine :: String,
     outputStdout :: Bool
   }
@@ -122,6 +196,8 @@ pOutputConfig =
     <$> optional (strOption (long "output-dot" <> short 'd' <> metavar "FILE" <> help ".dot output path"))
     <*> optional (strOption (long "output-png" <> short 'p' <> metavar "FILE" <> help ".png output path (requires `dot` or other engine in PATH)"))
     <*> optional (strOption (long "output-svg" <> short 's' <> metavar "FILE" <> help ".svg output path (requires `dot` or other engine in PATH)"))
+    <*> optional (strOption (long "output-html" <> long "html" <> metavar "FILE" <> help ".html output path"))
+    <*> optional (strOption (long "output-json" <> short 'j' <> metavar "FILE" <> help ".json output path"))
     <*> strOption (long "render-engine" <> metavar "CMD" <> help "Render engine to use with --output-png and --output-svg" <> value "dot" <> showDefault)
     <*> switch (long "output-stdout" <> help "Output to stdout")
 
diff --git a/src/Calligraphy/Util/Types.hs b/src/Calligraphy/Util/Types.hs
index d8da2d0..cd9d11f 100644
--- a/src/Calligraphy/Util/Types.hs
+++ b/src/Calligraphy/Util/Types.hs
@@ -14,6 +14,8 @@ module Calligraphy.Util.Types
     -- * Utility functions
     rekeyCalls,
     ppCallGraph,
+    moduleTree,
+    encodeModuleTree,
 
     -- * Lensy stuff
     over,
@@ -27,13 +29,19 @@ where
 import Calligraphy.Util.Lens
 import Calligraphy.Util.Printer
 import Control.Monad
+import Control.Monad.State (evalState, state)
+import qualified Data.Aeson as Aeson
 import Data.Bitraversable (bitraverse)
 import Data.EnumMap (EnumMap)
 import qualified Data.EnumMap as EnumMap
 import Data.EnumSet (EnumSet)
 import Data.Graph
+import Data.List (isPrefixOf)
+import Data.Semigroup (Max (Max))
 import Data.Set (Set)
 import qualified Data.Set as Set
+import Data.String (fromString)
+import Data.Tree (rootLabel)
 
 -- | This is the main type that processing phases will operate on.
 -- Note that calls and typing judgments are part of this top-level structure, not of the individual modules.
@@ -58,9 +66,104 @@ data Decl = Decl
     declLoc :: Loc
   }
 
+-- FIXME: Ord is too general and doesn't really fit the "is child of" property nicely
+-- Partition forest based on the value of the root nodes
+partitionForest :: Ord b => (a -> b) -> a -> Forest a -> (Forest a, Forest a, Forest a)
+partitionForest _ _ [] = ([], [], [])
+partitionForest f a (a' : as) =
+  let (smaller, eq, bigger) = partitionForest f a as
+   in case compare (f a) (f $ rootLabel a') of
+        LT -> (a' : smaller, eq, bigger)
+        EQ -> (smaller, a' : eq, bigger)
+        GT -> (smaller, eq, a' : bigger)
+
+-- build a tree such that parents < children
+buildOrdTree :: Ord b => (v -> b) -> [v] -> Forest v
+buildOrdTree f = insertForest []
+  where
+    insertForest forest [] = forest
+    insertForest forest (v : vs) =
+      case partitionForest f v forest of
+        (smaller, eq, []) -> insertForest (Node v smaller : eq) vs
+        ([], eq, [bigger]) -> insertForest (eq <> [insertInto v bigger]) vs
+        (_, _, _) -> error "invariant in buildOrdTree broken"
+    insertInto v (Node v' cs) = Node v' (insertForest cs [v])
+
+newtype Hierachy = Hierachy [String]
+
+instance Eq Hierachy where
+  a == b = compare a b == EQ
+
+instance Ord Hierachy where
+  compare (Hierachy xs) (Hierachy ys)
+    | xs == ys = EQ
+    | xs `isPrefixOf` ys = LT
+    | ys `isPrefixOf` xs = GT
+    | otherwise = EQ
+
+moduleTree :: CallGraph -> Tree (Key, Module)
+moduleTree (CallGraph modules _ _) = evalState (addKeys tree) (succ startKey)
+  where
+    tree = case forest of
+      [t] -> t
+      _ -> Node rootModule forest
+    rootModule = Module "" "" []
+    forest = buildOrdTree moduleHierarchy modules
+    Max startKey = foldMap (foldMap (foldMap (Max . declKey)) . moduleForest) modules
+    addKeys (Node a children) = do
+      c <- traverse addKeys children
+      k <- nextKey
+      pure $ Node (k, a) c
+      where
+        nextKey = state $ \k -> (k, succ k)
+
+encodeModuleTree :: Tree (Key, Module) -> Aeson.Value
+encodeModuleTree (Node (k, Module name fp decl) ch) =
+  let children = fmap encodeModuleTree ch <> fmap encodeDeclTree decl
+   in Aeson.object
+        [ (fromString "tag", fromString "module"),
+          (fromString "key", Aeson.toJSON $ unKey k),
+          (fromString "name", Aeson.toJSON name),
+          (fromString "filePath", Aeson.toJSON fp),
+          (fromString "children", Aeson.toJSON children)
+        ]
+
+encodeDeclTree :: Tree Decl -> Aeson.Value
+encodeDeclTree (Node decl ch) =
+  let children = fmap encodeDeclTree ch
+   in Aeson.object
+        [ (fromString "tag", fromString "declaration"),
+          (fromString "name", fromString . declName $ decl),
+          (fromString "key", Aeson.toJSON . unKey . declKey $ decl),
+          (fromString "exported", Aeson.toJSON . declExported $ decl),
+          (fromString "type", fromString . declTypeString . declType $ decl),
+          (fromString "location", encodeLoc . declLoc $ decl),
+          (fromString "children", Aeson.toJSON children)
+        ]
+  where
+    encodeLoc (Loc l c) =
+      Aeson.object
+        [ (fromString "line", Aeson.toJSON l),
+          (fromString "column", Aeson.toJSON c)
+        ]
+    declTypeString ValueDecl = "value"
+    declTypeString RecDecl = "record"
+    declTypeString ConDecl = "constructor"
+    declTypeString DataDecl = "data"
+    declTypeString ClassDecl = "type-class"
+
+moduleHierarchy :: Module -> Hierachy
+moduleHierarchy = Hierachy . splitDot . moduleName
+  where
+    splitDot str =
+      let (pre, post) = break (== '.') str
+       in case post of
+            [] -> [pre]
+            (_ : ys) -> pre : splitDot ys
+
 -- | A key in our own local space, c.f. a key that was generated by GHC.
 newtype Key = Key {unKey :: Int}
-  deriving (Enum, Show, Eq, Ord)
+  deriving (Enum, Show, Eq, Ord, Bounded)
 
 -- | A key that was produced by GHC, c.f. Key that we produced ourselves.
 -- We wrap it in a newtype because GHC itself uses a type synonym, but we want conversions to be as explicit as possible.