Within my .js configuration files, I have a tsconfig containing the property checkJs: true. A library called Terser includes the following type options:
ecma: 5 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020Despite setting ecma: 2017 in my configuration file, TypeScript interprets it as ecma: number. While in a .ts file I can simply use as const to define constants, is there a way to achieve the same in a .js file?
If you're looking to enforce const assertions in jsdoc, you can refer to this specific issue
// const variable: {
// readonly value: "example";
// }
let variable = /** @type {const} */ ({
value: "example"
})
// Alternatively
// let anotherVariable: {
// value: "example";
// }
let anotherVariable = {
value: /** @type {const} */ ("example")
}
Remember: the () around the expression specifying const is mandatory.
To ensure a constant value, I would implement two key steps:
Firstly - guarantee that the property remains unchangeable at runtime.
///config.js
const config = {
anotherProp: true,
ecma: 2017
};
Object.defineProperty(config, "ecma", { value: 2017, writable: false });
export default config;
Secondly, create a d.ts file to validate in TypeScript that this property is read-only
/// config.d.ts
type Config = {
anotherProp: string;
readonly ecma: 2017;
};
declare const conf: Config;
export default conf;
This approach will prompt TypeScript to flag any attempted modifications
//ts error: Cannot assign to 'ecma' because it is a read-only property.ts(2540)
config.ecma = 6;
Additionally, any attempts to modify it through hacking will result in runtime errors:
//runtime error: Cannot assign to read only property 'ecma' of object '#<Object>'
(config as any).ecma = 6;
Access the playground link for further exploration: here
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