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WasmFinalizeExportsPlugin.js
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Created
Tue, Feb 11, 00:16

WasmFinalizeExportsPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const formatLocation = require("../formatLocation");
const UnsupportedWebAssemblyFeatureError = require("./UnsupportedWebAssemblyFeatureError");
/** @typedef {import("../Compiler")} Compiler */
class WasmFinalizeExportsPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap("WasmFinalizeExportsPlugin", compilation => {
compilation.hooks.finishModules.tap(
"WasmFinalizeExportsPlugin",
modules => {
for (const module of modules) {
// 1. if a WebAssembly module
if (module.type.startsWith("webassembly") === true) {
const jsIncompatibleExports =
module.buildMeta.jsIncompatibleExports;
if (jsIncompatibleExports === undefined) {
continue;
}
for (const connection of compilation.moduleGraph.getIncomingConnections(
module
)) {
// 2. is active and referenced by a non-WebAssembly module
if (
connection.isTargetActive(undefined) &&
connection.originModule.type.startsWith("webassembly") ===
false
) {
const referencedExports = compilation.getDependencyReferencedExports(
connection.dependency,
undefined
);
for (const info of referencedExports) {
const names = Array.isArray(info) ? info : info.name;
if (names.length === 0) continue;
const name = names[0];
if (typeof name === "object") continue;
// 3. and uses a func with an incompatible JS signature
if (
Object.prototype.hasOwnProperty.call(
jsIncompatibleExports,
name
)
) {
// 4. error
const error = new UnsupportedWebAssemblyFeatureError(
`Export "${name}" with ${jsIncompatibleExports[name]} can only be used for direct wasm to wasm dependencies\n` +
`It's used from ${connection.originModule.readableIdentifier(
compilation.requestShortener
)} at ${formatLocation(connection.dependency.loc)}.`
);
error.module = module;
compilation.errors.push(error);
}
}
}
}
}
}
}
);
});
}
}
module.exports = WasmFinalizeExportsPlugin;

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