Verbose computed property transpilation

TypeScript Version: 2.7.0-dev.201xxxxx

Search Terms:

Code

const p1 = 0;
const p2 = 1;
class A {
  [p1] = 0;
  [p2]() {}
}

Expected behavior:

const p1 = 0;
const p2 = 1;
class A {
    constructor() {
        this[p1] = 0;
    }
    [p2]() { }
}

Actual behavior:

const p1 = 0;
const p2 = 1;
class A {
    constructor() {
        this[_a] = 0;
    }
    [(_a = p1, p2)]() { }
}
var _a;

Playground Link:

Related Issues:

Start by reproducing the TypeScript example in the issue and compare its emitted JavaScript with the expected output. Trace computed property handling during transpilation, then add coverage for the class field and computed method case; done means the unnecessary temporary variable and comma expression are no longer emitted.