1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/client/shared/vendor/source-map/lib/read-wasm.js b/devtools/client/shared/vendor/source-map/lib/read-wasm.js
new file mode 100644
index 0000000000..75d7bd5415
--- /dev/null
+++ b/devtools/client/shared/vendor/source-map/lib/read-wasm.js
@@ -0,0 +1,46 @@
+"use strict";
+
+const isNode =
+  typeof process !== "undefined" &&
+  process.versions != null &&
+  process.versions.node != null;
+
+let mappingsWasm = null;
+
+if (isNode) {
+  const fs = require("fs");
+  const path = require("path");
+
+  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;
+};