don't introduce a breaking change

packages/gatsby-transformer-toml/package.json

@@ -8,7 +8,6 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.0.0",
-    "bluebird": "^3.5.0",
     "toml": "^2.3.2"
   },
   "devDependencies": {
@@ -25,7 +24,7 @@
   ],
   "license": "MIT",
   "peerDependencies": {
-    "gatsby": "^2.0.15"
+    "gatsby": "^2.0.0"
   },
   "repository": "https://github.com/gatsbyjs/gatsby/tree/master/packages/gatsby-transformer-toml",
   "scripts": {

packages/gatsby-transformer-toml/src/__tests__/__snapshots__/gatsby-node.js.snap

@@ -103,3 +103,107 @@ Array [
   ],
 ]
 `;
+
+exports[`Process TOML nodes correctly fallsback to crypto when createDigestContent is not available 1`] = `
+Array [
+  Array [
+    Object {
+      "children": Array [],
+      "id": "uuid-from-gatsby",
+      "internal": Object {
+        "contentDigest": "contentDigest fallback",
+        "type": "",
+      },
+      "parent": "whatever",
+      "the": Object {
+        "hard": Object {
+          "another_test_string": " Same thing, but with a string #",
+          "bit#": Object {
+            "multi_line_array": Array [
+              "]",
+            ],
+            "what?": "You don't think some user won't do that?",
+          },
+          "harder_test_string": " And when \\"'s are in the string, along with # \\"",
+          "test_array": Array [
+            "] ",
+            " # ",
+          ],
+          "test_array2": Array [
+            "Test #11 ]proved that",
+            "Experiment #9 was a success",
+          ],
+        },
+        "test_string": "You'll hate me after this - #",
+      },
+    },
+  ],
+]
+`;
+
+exports[`Process TOML nodes correctly fallsback to crypto when createDigestContent is not available 2`] = `
+Array [
+  Array [
+    Object {
+      "child": Object {
+        "children": Array [],
+        "id": "uuid-from-gatsby",
+        "internal": Object {
+          "contentDigest": "contentDigest fallback",
+          "type": "",
+        },
+        "parent": "whatever",
+        "the": Object {
+          "hard": Object {
+            "another_test_string": " Same thing, but with a string #",
+            "bit#": Object {
+              "multi_line_array": Array [
+                "]",
+              ],
+              "what?": "You don't think some user won't do that?",
+            },
+            "harder_test_string": " And when \\"'s are in the string, along with # \\"",
+            "test_array": Array [
+              "] ",
+              " # ",
+            ],
+            "test_array2": Array [
+              "Test #11 ]proved that",
+              "Experiment #9 was a success",
+            ],
+          },
+          "test_string": "You'll hate me after this - #",
+        },
+      },
+      "parent": Object {
+        "children": Array [],
+        "content": "
+    [the]
+    test_string = \\"You'll hate me after this - #\\"
+
+    [the.hard]
+    test_array = [ \\"] \\", \\" # \\"]      # ]
+    test_array2 = [ \\"Test #11 ]proved that\\", \\"Experiment #9 was a success\\" ]
+    another_test_string = \\" Same thing, but with a string #\\"
+    harder_test_string = \\" And when /\\"'s are in the string, along with # /\\"\\"
+    # Things will get harder
+
+        [the.hard.\\"bit#\\"]
+        \\"what?\\" = \\"You don't think some user won't do that?\\"
+        multi_line_array = [
+            \\"]\\",
+            # ] Oh yes I did
+            ]
+    ",
+        "extension": "toml",
+        "id": "whatever",
+        "internal": Object {
+          "contentDigest": "whatever",
+        },
+        "name": "test",
+        "parent": null,
+      },
+    },
+  ],
+]
+`;

packages/gatsby-transformer-toml/src/__tests__/gatsby-node.js

@@ -43,13 +43,61 @@ describe(`Process TOML nodes correctly`, () => {
     const createNodeId = jest.fn()
     createNodeId.mockReturnValue(`uuid-from-gatsby`)
     const createDigestContent = jest.fn().mockReturnValue(`contentDigest`)
+    jest.mock(`../create-content-digest`)
+    const createDigestContentFallback = require(`../create-content-digest`)
 
     await onCreateNode({
       node,
       loadNodeContent,
       actions,
       createNodeId,
       createDigestContent,
+    }).then(() => {
+      expect(createNode.mock.calls).toMatchSnapshot()
+      expect(createParentChildLink.mock.calls).toMatchSnapshot()
+      expect(createNode).toHaveBeenCalledTimes(1)
+      expect(createParentChildLink).toHaveBeenCalledTimes(1)
+      expect(createDigestContent).toHaveBeenCalledTimes(1)
+      expect(createDigestContentFallback).toHaveBeenCalledTimes(0)
+    })
+  })
+
+  it(`fallsback to crypto when createDigestContent is not available`, async () => {
+    // Unfortunately due to TOML limitations no JSON -> TOML convertors exist,
+    // which means that we are stuck with JS template literals.
+    node.content = `
+    [the]
+    test_string = "You'll hate me after this - #"
+
+    [the.hard]
+    test_array = [ "] ", " # "]      # ]
+    test_array2 = [ "Test #11 ]proved that", "Experiment #9 was a success" ]
+    another_test_string = " Same thing, but with a string #"
+    harder_test_string = " And when \\"'s are in the string, along with # \\""
+    # Things will get harder
+
+        [the.hard."bit#"]
+        "what?" = "You don't think some user won't do that?"
+        multi_line_array = [
+            "]",
+            # ] Oh yes I did
+            ]
+    `
+
+    const createNode = jest.fn()
+    const createParentChildLink = jest.fn()
+    const actions = { createNode, createParentChildLink }
+    const createNodeId = jest.fn()
+    createNodeId.mockReturnValue(`uuid-from-gatsby`)
+    jest.mock(`../create-content-digest`)
+    const createDigestContent = require(`../create-content-digest`)
+    createDigestContent.mockImplementation(() => `contentDigest fallback`)
+
+    await onCreateNode({
+      node,
+      loadNodeContent,
+      actions,
+      createNodeId,
     }).then(() => {
       expect(createNode.mock.calls).toMatchSnapshot()
       expect(createParentChildLink.mock.calls).toMatchSnapshot()

packages/gatsby-transformer-toml/src/create-content-digest.js

@@ -0,0 +1,9 @@
+// TODO remove in gatsby v3
+// keeps old behaviour in tact when createDigestContent is not available
+const crypto = require(`crypto`)
+
+module.exports = content =>
+  crypto
+    .createHash(`md5`)
+    .update(content)
+    .digest(`hex`)

packages/gatsby-transformer-toml/src/gatsby-node.js

@@ -24,7 +24,9 @@ async function onCreateNode({
   // 1) More TOML files -> more types
   // 2) Different files with the same name creating conflicts
   const parsedContentStr = JSON.stringify(parsedContent)
-  const contentDigest = createDigestContent(parsedContentStr)
+  const contentDigest = createDigestContent
+    ? createDigestContent(parsedContentStr)
+    : require(`./create-content-digest`)(parsedContentStr)
 
   const newNode = {
     ...parsedContent,