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diff --git a/lib/read-wasm.js b/lib/read-wasm.js
index a4fb29c295516..75d7bd54153ad 100644
--- a/lib/read-wasm.js
+++ b/lib/read-wasm.js
@@ -1,22 +1,45 @@
"use strict";
+const isNode =
+ typeof process !== "undefined" &&
+ process.versions != null &&
+ process.versions.node != null;
+
let mappingsWasm = null;
-module.exports = function readWasm() {
- if (typeof mappingsWasm === "string") {
- return fetch(mappingsWasm).then(response => response.arrayBuffer());
- }
- if (mappingsWasm instanceof ArrayBuffer) {
- return Promise.resolve(mappingsWasm);
- }
+if (isNode) {
+ const fs = require("fs");
+ const path = require("path");
- throw new Error(
- "You must provide the string URL or ArrayBuffer contents " +
- "of lib/mappings.wasm by calling " +
- "SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) " +
- "before using SourceMapConsumer"
- );
-};
+ module.exports = function readWasm() {
+ return new Promise((resolve, reject) => {
+ const wasmPath = path.join(__dirname, "mappings.wasm");
+ fs.readFile(wasmPath, null, (error, data) => {
+ if (error) {
+ reject(error);
+ return;
+ }
+
+ resolve(data.buffer);
+ });
+ });
+ };
+} else {
+ module.exports = function readWasm() {
+ if (typeof mappingsWasm === "string") {
+ return fetch(mappingsWasm)
+ .then(response => response.arrayBuffer());
+ }
+ if (mappingsWasm instanceof ArrayBuffer) {
+ return Promise.resolve(mappingsWasm);
+ }
+
+ throw new Error("You must provide the string URL or ArrayBuffer contents " +
+ "of lib/mappings.wasm by calling " +
+ "SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) " +
+ "before using SourceMapConsumer");
+ };
+}
module.exports.initialize = input => {
mappingsWasm = input;
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