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misc/wasm: improve detection of Node.js 

This commit adds a check of "process.title" to detect Node.js.

The web app bundler Parcel sets "process" to an empty object. This
incorrectly got detected as Node.js, even though the script was
running in a browser.

Fixes #28364.

Change-Id: Iecac7f8fc3cc4ac7ddb42dd43c5385681a3282de
Reviewed-on: https://go-review.googlesource.com/c/144658
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Richard Musiol 2018-10-25 23:11:10 +02:00 committed by Richard Musiol
parent dd789550a7
commit 9627180f0f
1 changed files with 11 additions and 9 deletions
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20
misc/wasm/wasm_exec.js
View File

@ -3,8 +3,18 @@
// license that can be found in the LICENSE file.
(() => {
if (typeof global !== "undefined") {
// global already exists
} else if (typeof window !== "undefined") {
window.global = window;
} else if (typeof self !== "undefined") {
self.global = self;
} else {
throw new Error("cannot export Go (neither global, window nor self is defined)");
}
// Map web browser API and Node.js API to a single common API (preferring web standards over Node.js API).
const isNodeJS = typeof process !== "undefined";
const isNodeJS = global.process && global.process.title === "node";
if (isNodeJS) {
global.require = require;
global.fs = require("fs");
@ -27,14 +37,6 @@
global.TextEncoder = util.TextEncoder;
global.TextDecoder = util.TextDecoder;
} else {
if (typeof window !== "undefined") {
window.global = window;
} else if (typeof self !== "undefined") {
self.global = self;
} else {
throw new Error("cannot export Go (neither window nor self is defined)");
}
let outputBuf = "";
global.fs = {
constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused