emnapiModularization
By default Emscripten emit all code in a straightforward way into the output .js file. That means that if you load that in a script tag in a web page, it will use the global scope.
js
// the output js
var Module = typeof Module !== "undefined" ? Module : {};
// var ...
function run(args) {
// ...
}
run();// the output js
var Module = typeof Module !== "undefined" ? Module : {};
// var ...
function run(args) {
// ...
}
run();Using MODULARIZE Setting
You can set -sMODULARIZE and -sEXPORT_NAME=createModule to tell Emscripten to emit UMD module, the code is wrapped in the exported factory function that returns a promise.
js
var createModule = (() => {
var _scriptDir = typeof document !== 'undefined' && document.currentScript ? document.currentScript.src : undefined;
if (typeof __filename !== 'undefined') _scriptDir = _scriptDir || __filename;
return (
function(createModule) {
createModule = createModule || {};
var Module = typeof createModule !== "undefined" ? createModule : {};
// ...
Module["ready"] = new Promise(function(resolve, reject) {
readyPromiseResolve = resolve;
readyPromiseReject = reject;
});
function run(args) {
// ...
}
run();
return createModule.ready;
}
);
})();
if (typeof exports === 'object' && typeof module === 'object')
module.exports = createModule;
else if (typeof define === 'function' && define['amd'])
define([], function() { return createModule; });
else if (typeof exports === 'object')
exports["createModule"] = createModule;var createModule = (() => {
var _scriptDir = typeof document !== 'undefined' && document.currentScript ? document.currentScript.src : undefined;
if (typeof __filename !== 'undefined') _scriptDir = _scriptDir || __filename;
return (
function(createModule) {
createModule = createModule || {};
var Module = typeof createModule !== "undefined" ? createModule : {};
// ...
Module["ready"] = new Promise(function(resolve, reject) {
readyPromiseResolve = resolve;
readyPromiseReject = reject;
});
function run(args) {
// ...
}
run();
return createModule.ready;
}
);
})();
if (typeof exports === 'object' && typeof module === 'object')
module.exports = createModule;
else if (typeof define === 'function' && define['amd'])
define([], function() { return createModule; });
else if (typeof exports === 'object')
exports["createModule"] = createModule;The returned promise is resolved with the module instance when it is safe to run the compiled code, similar to the onRuntimeInitialized callback. You do not need to use the onRuntimeInitialized callback when using -sMODULARIZE.
The factory function accepts 1 parameter, an object with default values for the module instance:
js
createModule({
// Emscripten module init options
}).then((Module) => {
const binding = Module.emnapiInit({ context })
})
// or
const Module = await createModule({
// Emscripten module init options
})
const binding = Module.emnapiInit({ context })createModule({
// Emscripten module init options
}).then((Module) => {
const binding = Module.emnapiInit({ context })
})
// or
const Module = await createModule({
// Emscripten module init options
})
const binding = Module.emnapiInit({ context })