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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, runtimeToString } = require("../util/runtime");
const NullDependency = require("./NullDependency");
/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").RuntimeSpec} RuntimeSpec */
/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../ModuleGraphConnection").ConnectionState} ConnectionState */
/** @typedef {import("../javascript/JavascriptParser").Range} Range */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
/** @typedef {import("../util/Hash")} Hash */
class PureExpressionDependency extends NullDependency {
/**
* @param {Range} range the source range
*/
constructor(range) {
super();
this.range = range;
/** @type {Set<string> | false} */
this.usedByExports = false;
}
/**
* @param {ModuleGraph} moduleGraph module graph
* @param {RuntimeSpec} runtime current runtimes
* @returns {boolean | RuntimeSpec} runtime condition
*/
_getRuntimeCondition(moduleGraph, runtime) {
const usedByExports = this.usedByExports;
if (usedByExports !== false) {
const selfModule =
/** @type {Module} */
(moduleGraph.getParentModule(this));
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;
});
return runtimeCondition;
}
return false;
}
/**
* Update the hash
* @param {Hash} hash hash to be updated
* @param {UpdateHashContext} context context
* @returns {void}
*/
updateHash(hash, context) {
const runtimeCondition = this._getRuntimeCondition(
context.chunkGraph.moduleGraph,
context.runtime
);
if (runtimeCondition === true) {
return;
} else if (runtimeCondition === false) {
hash.update("null");
} else {
hash.update(
`${runtimeToString(runtimeCondition)}|${runtimeToString(
context.runtime
)}`
);
}
hash.update(String(this.range));
}
/**
* @param {ModuleGraph} moduleGraph the module graph
* @returns {ConnectionState} how this dependency connects the module to referencing modules
*/
getModuleEvaluationSideEffectsState(moduleGraph) {
return false;
}
/**
* @param {ObjectSerializerContext} context context
*/
serialize(context) {
const { write } = context;
write(this.range);
write(this.usedByExports);
super.serialize(context);
}
/**
* @param {ObjectDeserializerContext} context 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 runtimeCondition = dep._getRuntimeCondition(moduleGraph, runtime);
if (runtimeCondition === true) {
// Do nothing
} else if (runtimeCondition === false) {
source.insert(
dep.range[0],
"(/* unused pure expression or super */ null && ("
);
source.insert(dep.range[1], "))");
} else {
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)");
}
}
};
module.exports = PureExpressionDependency;