swc/crates/swc_ecma_parser/tests/tsc/annotatedThisPropertyInitializerDoesntNarrow.ts

// @noEmit: true
// @allowJs: true
// @checkJs: true
// @Filename: Compilation.js
// from webpack/lib/Compilation.js and filed at #26427
/** @param {{ [s: string]: number }} map */
function mappy(map) {}

export class C {
    constructor() {
        /** @type {{ [assetName: string]: number}} */
        this.assets = {};
    }
    m() {
        mappy(this.assets)
    }
}