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import {source as injectedSource} from '../generated/injected.js';
class ScriptInjector {
#updated = false;
#amendments = new Set<string>();
// Appends a statement of the form `(PuppeteerUtil) => {...}`.
append(statement: string): void {
this.#update(() => {
this.#amendments.add(statement);
});
}
pop(statement: string): void {
this.#update(() => {
this.#amendments.delete(statement);
});
}
inject(inject: (script: string) => void, force = false) {
if (this.#updated || force) {
inject(this.#get());
}
this.#updated = false;
}
#update(callback: () => void): void {
callback();
this.#updated = true;
}
#get(): string {
return `(() => {
const module = {};
${injectedSource}
${[...this.#amendments]
.map(statement => {
return `(${statement})(module.exports.default);`;
})
.join('')}
return module.exports.default;
})()`;
}
}
/**
* @internal
*/
export const scriptInjector = new ScriptInjector();
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