@storybook/angular
Version:
Storybook for Angular: Develop Angular components in isolation with hot reloading.
50 lines (49 loc) • 1.9 kB
JavaScript
const queue = [];
let isProcessing = false;
/**
* Reset compiled components because we often want to compile the same component with more than one
* NgModule.
*/
const resetCompiledComponents = async () => {
try {
// Clear global Angular component cache in order to be able to re-render the same component across multiple stories
//
// References:
// https://github.com/angular/angular-cli/blob/master/packages/angular_devkit/build_angular/src/webpack/plugins/hmr/hmr-accept.ts#L50
// https://github.com/angular/angular/blob/2ebe2bcb2fe19bf672316b05f15241fd7fd40803/packages/core/src/render3/jit/module.ts#L377-L384
const { ɵresetCompiledComponents } = await import('@angular/core');
ɵresetCompiledComponents();
}
catch (e) {
/** Noop catch This means angular removed or modified ɵresetCompiledComponents */
}
};
/**
* Queue bootstrapping, so that only one application can be bootstrapped at a time.
*
* Bootstrapping multiple applications at once can cause Angular to throw an error that a component
* is declared in multiple modules. This avoids two stories confusing the Angular compiler, by
* bootstrapping more that one application at a time.
*
* @param fn Callback that should complete the bootstrap process
* @returns ApplicationRef from the completed bootstrap process
*/
export const queueBootstrapping = (fn) => {
return new Promise((resolve, reject) => {
queue.push(() => fn().then(resolve).catch(reject));
if (!isProcessing) {
processQueue();
}
});
};
const processQueue = async () => {
isProcessing = true;
while (queue.length > 0) {
const bootstrappingFn = queue.shift();
if (bootstrappingFn) {
await bootstrappingFn();
await resetCompiledComponents();
}
}
isProcessing = false;
};