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JavascriptGenerator.js
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Fri, Feb 21, 04:04

JavascriptGenerator.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const util = require("util");
const { RawSource, ReplaceSource } = require("webpack-sources");
const Generator = require("../Generator");
const InitFragment = require("../InitFragment");
const HarmonyCompatibilityDependency = require("../dependencies/HarmonyCompatibilityDependency");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../DependenciesBlock")} DependenciesBlock */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../DependencyTemplates")} DependencyTemplates */
/** @typedef {import("../Generator").GenerateContext} GenerateContext */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../Module").ConcatenationBailoutReasonContext} ConcatenationBailoutReasonContext */
/** @typedef {import("../NormalModule")} NormalModule */
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
// TODO: clean up this file
// replace with newer constructs
const deprecatedGetInitFragments = util.deprecate(
(template, dependency, templateContext) =>
template.getInitFragments(dependency, templateContext),
"DependencyTemplate.getInitFragment is deprecated (use apply(dep, source, { initFragments }) instead)",
"DEP_WEBPACK_JAVASCRIPT_GENERATOR_GET_INIT_FRAGMENTS"
);
const TYPES = new Set(["javascript"]);
class JavascriptGenerator extends Generator {
/**
* @param {NormalModule} module fresh module
* @returns {Set<string>} available types (do not mutate)
*/
getTypes(module) {
return TYPES;
}
/**
* @param {NormalModule} module the module
* @param {string=} type source type
* @returns {number} estimate size of the module
*/
getSize(module, type) {
const originalSource = module.originalSource();
if (!originalSource) {
return 39;
}
return originalSource.size();
}
/**
* @param {NormalModule} module module for which the bailout reason should be determined
* @param {ConcatenationBailoutReasonContext} context context
* @returns {string | undefined} reason why this module can't be concatenated, undefined when it can be concatenated
*/
getConcatenationBailoutReason(module, context) {
// Only harmony modules are valid for optimization
if (
!module.buildMeta ||
module.buildMeta.exportsType !== "namespace" ||
module.presentationalDependencies === undefined ||
!module.presentationalDependencies.some(
d => d instanceof HarmonyCompatibilityDependency
)
) {
return "Module is not an ECMAScript module";
}
// Some expressions are not compatible with module concatenation
// because they may produce unexpected results. The plugin bails out
// if some were detected upfront.
if (module.buildInfo && module.buildInfo.moduleConcatenationBailout) {
return `Module uses ${module.buildInfo.moduleConcatenationBailout}`;
}
}
/**
* @param {NormalModule} module module for which the code should be generated
* @param {GenerateContext} generateContext context for generate
* @returns {Source} generated code
*/
generate(module, generateContext) {
const originalSource = module.originalSource();
if (!originalSource) {
return new RawSource("throw new Error('No source available');");
}
const source = new ReplaceSource(originalSource);
const initFragments = [];
this.sourceModule(module, initFragments, source, generateContext);
return InitFragment.addToSource(source, initFragments, generateContext);
}
/**
* @param {Module} module the module to generate
* @param {InitFragment[]} initFragments mutable list of init fragments
* @param {ReplaceSource} source the current replace source which can be modified
* @param {GenerateContext} generateContext the generateContext
* @returns {void}
*/
sourceModule(module, initFragments, source, generateContext) {
for (const dependency of module.dependencies) {
this.sourceDependency(
module,
dependency,
initFragments,
source,
generateContext
);
}
if (module.presentationalDependencies !== undefined) {
for (const dependency of module.presentationalDependencies) {
this.sourceDependency(
module,
dependency,
initFragments,
source,
generateContext
);
}
}
for (const childBlock of module.blocks) {
this.sourceBlock(
module,
childBlock,
initFragments,
source,
generateContext
);
}
}
/**
* @param {Module} module the module to generate
* @param {DependenciesBlock} block the dependencies block which will be processed
* @param {InitFragment[]} initFragments mutable list of init fragments
* @param {ReplaceSource} source the current replace source which can be modified
* @param {GenerateContext} generateContext the generateContext
* @returns {void}
*/
sourceBlock(module, block, initFragments, source, generateContext) {
for (const dependency of block.dependencies) {
this.sourceDependency(
module,
dependency,
initFragments,
source,
generateContext
);
}
for (const childBlock of block.blocks) {
this.sourceBlock(
module,
childBlock,
initFragments,
source,
generateContext
);
}
}
/**
* @param {Module} module the current module
* @param {Dependency} dependency the dependency to generate
* @param {InitFragment[]} initFragments mutable list of init fragments
* @param {ReplaceSource} source the current replace source which can be modified
* @param {GenerateContext} generateContext the render context
* @returns {void}
*/
sourceDependency(module, dependency, initFragments, source, generateContext) {
const constructor = /** @type {new (...args: any[]) => Dependency} */ (dependency.constructor);
const template = generateContext.dependencyTemplates.get(constructor);
if (!template) {
throw new Error(
"No template for dependency: " + dependency.constructor.name
);
}
const templateContext = {
runtimeTemplate: generateContext.runtimeTemplate,
dependencyTemplates: generateContext.dependencyTemplates,
moduleGraph: generateContext.moduleGraph,
chunkGraph: generateContext.chunkGraph,
module,
runtime: generateContext.runtime,
runtimeRequirements: generateContext.runtimeRequirements,
concatenationScope: generateContext.concatenationScope,
initFragments
};
template.apply(dependency, source, templateContext);
// TODO remove in webpack 6
if ("getInitFragments" in template) {
const fragments = deprecatedGetInitFragments(
template,
dependency,
templateContext
);
if (fragments) {
for (const fragment of fragments) {
initFragments.push(fragment);
}
}
}
}
}
module.exports = JavascriptGenerator;

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