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add support for tree-shaking JSON modules
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| /* | ||
| MIT License http://www.opensource.org/licenses/mit-license.php | ||
| Author Tobias Koppers @sokra | ||
| */ | ||
|
|
||
| "use strict"; | ||
|
|
||
| const makeSerializable = require("../util/makeSerializable"); | ||
| const NullDependency = require("./NullDependency"); | ||
|
|
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| /** @typedef {import("../ChunkGraph")} ChunkGraph */ | ||
| /** @typedef {import("../Dependency").ExportSpec} ExportSpec */ | ||
| /** @typedef {import("../Dependency").ExportsSpec} ExportsSpec */ | ||
| /** @typedef {import("../ModuleGraph")} ModuleGraph */ | ||
| /** @typedef {import("../util/Hash")} Hash */ | ||
|
|
||
| const getExportsFromData = data => { | ||
| if (data && typeof data === "object") { | ||
| if (Array.isArray(data)) { | ||
| return data.map((item, idx) => { | ||
| return { | ||
| name: `${idx}`, | ||
| canMangle: true, | ||
| exports: getExportsFromData(item) | ||
| }; | ||
| }); | ||
| } else { | ||
| const exports = []; | ||
| for (const key of Object.keys(data)) { | ||
| exports.push({ | ||
| name: key, | ||
| canMangle: true, | ||
| exports: getExportsFromData(data[key]) | ||
| }); | ||
| } | ||
| return exports; | ||
| } | ||
| } | ||
| return undefined; | ||
| }; | ||
|
|
||
| class JsonExportsDependency extends NullDependency { | ||
| /** | ||
| * @param {(string | ExportSpec)[]} exports json exports | ||
| */ | ||
| constructor(exports) { | ||
| super(); | ||
| this.exports = exports; | ||
| } | ||
|
|
||
| get type() { | ||
| return "json exports"; | ||
| } | ||
|
|
||
| /** | ||
| * Returns the exported names | ||
| * @param {ModuleGraph} moduleGraph module graph | ||
| * @returns {ExportsSpec | undefined} export names | ||
| */ | ||
| getExports(moduleGraph) { | ||
| return { | ||
| exports: this.exports, | ||
| dependencies: undefined | ||
| }; | ||
| } | ||
|
|
||
| /** | ||
| * Update the hash | ||
| * @param {Hash} hash hash to be updated | ||
| * @param {ChunkGraph} chunkGraph chunk graph | ||
| * @returns {void} | ||
| */ | ||
| updateHash(hash, chunkGraph) { | ||
| hash.update(this.exports ? JSON.stringify(this.exports) : "undefined"); | ||
| super.updateHash(hash, chunkGraph); | ||
| } | ||
|
|
||
| serialize(context) { | ||
| const { write } = context; | ||
| write(this.exports); | ||
| super.serialize(context); | ||
| } | ||
|
|
||
| deserialize(context) { | ||
| const { read } = context; | ||
| this.exports = read(); | ||
| super.deserialize(context); | ||
| } | ||
| } | ||
|
|
||
| makeSerializable( | ||
| JsonExportsDependency, | ||
| "webpack/lib/dependencies/JsonExportsDependency" | ||
| ); | ||
|
|
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| module.exports = JsonExportsDependency; | ||
| module.exports.getExportsFromData = getExportsFromData; |
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