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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 { filterRuntime } = require("../util/runtime");
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("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../ModuleGraphConnection").ConnectionState} ConnectionState */
/** @typedef {import("../util/Hash")} Hash */
class PureExpressionDependency extends NullDependency {
/**
* @param {[number, number]} range the source range
*/
constructor(range) {
super();
this.range = range;
/** @type {Set<string> | false} */
this.usedByExports = false;
}
/**
* Update the hash
* @param {Hash} hash hash to be updated
* @param {UpdateHashContext} context context
* @returns {void}
*/
updateHash(hash, context) {
hash.update(this.range + "");
}
/**
* @param {ModuleGraph} moduleGraph the module graph
* @returns {ConnectionState} how this dependency connects the module to referencing modules
*/
getModuleEvaluationSideEffectsState(moduleGraph) {
return false;
}
serialize(context) {
const { write } = context;
write(this.range);
write(this.usedByExports);
super.serialize(context);
}
deserialize(context) {
const { read } = context;
this.range = read();
this.usedByExports = read();
super.deserialize(context);
}
}
makeSerializable(
PureExpressionDependency,
"webpack/lib/dependencies/PureExpressionDependency"
);
PureExpressionDependency.Template = class PureExpressionDependencyTemplate 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,
{ chunkGraph, moduleGraph, runtime, runtimeTemplate, runtimeRequirements }
) {
const dep = /** @type {PureExpressionDependency} */ (dependency);
const usedByExports = dep.usedByExports;
if (usedByExports !== false) {
const selfModule = moduleGraph.getParentModule(dep);
const exportsInfo = moduleGraph.getExportsInfo(selfModule);
const runtimeCondition = filterRuntime(runtime, runtime => {
for (const exportName of usedByExports) {
if (exportsInfo.getUsed(exportName, runtime) !== UsageState.Unused) {
return true;
}
}
return false;
});
if (runtimeCondition === true) return;
if (runtimeCondition !== false) {
const condition = runtimeTemplate.runtimeConditionExpression({
chunkGraph,
runtime,
runtimeCondition,
runtimeRequirements
});
source.insert(
dep.range[0],
`(/* runtime-dependent pure expression or super */ ${condition} ? (`
);
source.insert(dep.range[1], ") : null)");
return;
}
}
source.insert(
dep.range[0],
`(/* unused pure expression or super */ null && (`
);
source.insert(dep.range[1], "))");
}
};
module.exports = PureExpressionDependency;