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ExportsInfoDependency.js
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Tue, Feb 4, 09:02

ExportsInfoDependency.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { UsageState } = require("../ExportsInfo");
const makeSerializable = require("../util/makeSerializable");
const NullDependency = require("./NullDependency");
/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
/**
* @param {ModuleGraph} moduleGraph the module graph
* @param {Module} module the module
* @param {string | null} exportName name of the export if any
* @param {string | null} property name of the requested property
* @param {RuntimeSpec} runtime for which runtime
* @returns {any} value of the property
*/
const getProperty = (moduleGraph, module, exportName, property, runtime) => {
if (!exportName) {
switch (property) {
case "usedExports": {
const usedExports = moduleGraph
.getExportsInfo(module)
.getUsedExports(runtime);
if (
typeof usedExports === "boolean" ||
usedExports === undefined ||
usedExports === null
) {
return usedExports;
}
return Array.from(usedExports).sort();
}
}
}
switch (property) {
case "used":
return (
moduleGraph.getExportsInfo(module).getUsed(exportName, runtime) !==
UsageState.Unused
);
case "useInfo": {
const state = moduleGraph
.getExportsInfo(module)
.getUsed(exportName, runtime);
switch (state) {
case UsageState.Used:
case UsageState.OnlyPropertiesUsed:
return true;
case UsageState.Unused:
return false;
case UsageState.NoInfo:
return undefined;
case UsageState.Unknown:
return null;
default:
throw new Error(`Unexpected UsageState ${state}`);
}
}
case "provideInfo":
return moduleGraph.getExportsInfo(module).isExportProvided(exportName);
}
return undefined;
};
class ExportsInfoDependency extends NullDependency {
constructor(range, exportName, property) {
super();
this.range = range;
this.exportName = exportName;
this.property = property;
}
/**
* Update the hash
* @param {Hash} hash hash to be updated
* @param {UpdateHashContext} context context
* @returns {void}
*/
updateHash(hash, context) {
const { chunkGraph, runtime } = context;
const { moduleGraph } = chunkGraph;
const module = moduleGraph.getParentModule(this);
const value = getProperty(
moduleGraph,
module,
this.exportName,
this.property,
runtime
);
hash.update(value === undefined ? "undefined" : JSON.stringify(value));
}
serialize(context) {
const { write } = context;
write(this.range);
write(this.exportName);
write(this.property);
super.serialize(context);
}
static deserialize(context) {
const obj = new ExportsInfoDependency(
context.read(),
context.read(),
context.read()
);
obj.deserialize(context);
return obj;
}
}
makeSerializable(
ExportsInfoDependency,
"webpack/lib/dependencies/ExportsInfoDependency"
);
ExportsInfoDependency.Template = class ExportsInfoDependencyTemplate extends (
NullDependency.Template
) {
/**
* @param {Dependency} dependency the dependency for which the template should be applied
* @param {ReplaceSource} source the current replace source which can be modified
* @param {DependencyTemplateContext} templateContext the context object
* @returns {void}
*/
apply(dependency, source, { module, moduleGraph, runtime }) {
const dep = /** @type {ExportsInfoDependency} */ (dependency);
const value = getProperty(
moduleGraph,
module,
dep.exportName,
dep.property,
runtime
);
source.replace(
dep.range[0],
dep.range[1] - 1,
value === undefined ? "undefined" : JSON.stringify(value)
);
}
};
module.exports = ExportsInfoDependency;

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