feat: Output module and file sizes

lib/__tests__/__snapshots__/print.js.md

@@ -12,6 +12,7 @@ Generated by [AVA](https://ava.li).
       '',
       ` MODULE  react-tap-event-plugin␊
       ├─ imported: 1 time␊
+      ├─ size: 1 KiB [for all included files]␊
       ├─ type: [direct]␊
       ├─ locations: ␊
       │  └─ delegated ./node_modules/react-tap-event-plugin/␊

lib/analyze.js

@@ -39,6 +39,7 @@ export type PreModule = {
 
 export type Module = {
   name: string,
+  size: number,
   clearName: string,
   imported: number,
   type: string,
@@ -106,11 +107,14 @@ const flattenChunks = (stats /*: WebpackStats */) /*: Array<WebpackModule> */ =>
 const isNodeModules = (identifier /*: string */) =>
   identifier.indexOf("node_modules") > -1;
 
+const safeModuleSize = (size /*?: number */) => (size ? size : 0);
+
 const joinModules = (modules) /*: { [string]: Module } */ =>
   modules.reduce((acc, module /*: PreModule */) => {
     if (module.type === "file") {
       const joined = acc[module.name] || {
         type: module.type,
+        size: safeModuleSize(module.size),
         imported: 0,
         reasons: [],
         depsChains: []
@@ -131,6 +135,7 @@ const joinModules = (modules) /*: { [string]: Module } */ =>
       const joined = acc[module.clearName] || {
         imported: 0,
         type: module.type,
+        size: 0,
         depsType: "unknown",
         reasons: [],
         locations: [],
@@ -193,6 +198,7 @@ const joinModules = (modules) /*: { [string]: Module } */ =>
         : "transitive";
       joined.locations.push(module.location);
       joined.filesIncluded.push(module.name);
+      joined.size += safeModuleSize(module.size);
 
       acc[module.clearName] = joined;
     }
@@ -288,7 +294,10 @@ module.exports = function analyze(
   ignore /*: Array<string> */ = [],
   updateProgressBar /*: UpdateProgressBar */ = () => {}
 ) {
-  const stats = rawStats.children ? joinStats(rawStats.children) : rawStats;
+  const stats =
+    rawStats.children && rawStats.children.length
+      ? joinStats(rawStats.children)
+      : rawStats;
   const rawModules = flattenChunks(stats);
   const ignorePatterns = [].concat(DEFAULT_IGNORE).concat(ignore);
   const modules = pickFromModules(rawModules);

lib/print.js

@@ -154,10 +154,24 @@ const printType = (module, by, limit) => {
   return type;
 };
 
+const printSize = (size /*: number */, mod = false) => {
+  const sizeInKiB = Math.ceil(size / 1024);
+  const level =
+    sizeInKiB > 20
+      ? "red"
+      : sizeInKiB < 20 && sizeInKiB > 10 ? "yellow" : "default";
+  const sizeFormatted =
+    level === "default" ? sizeInKiB + " KiB" : chalk[level](sizeInKiB + " KiB");
+  return `${chalk.magenta("size")}: ${sizeFormatted}${
+    mod ? chalk.dim(" [for all included files]") : ""
+  }`;
+};
+
 const printFile = (module /*: Module */, limit, by) => {
   return [
     `${fileBadge()} ${chalk.green(module.name)}`,
     `├─ ${chalk.magenta("imported")}: ${printImportedCount(module.imported)}`,
+    `├─ ${printSize(module.size)}`,
     `└─ ${chalk.magenta("reasons")}:`,
     indent(printReasons(module.reasons, limit, by), " ").join("\n")
   ];
@@ -167,6 +181,7 @@ const printModule = (module /*: Module */, limit, by) => {
   return [
     `${moduleBadge()} ${chalk.yellow(module.name)}`,
     `├─ ${chalk.magenta("imported")}: ${printImportedCount(module.imported)}`,
+    `├─ ${printSize(module.size, true)}`,
     printType(module, by, limit).join("\n"),
     `├─ ${chalk.magenta("locations")}: ${
       module.locations.length > 1 ? redBadge("multiple") : ""