Array constructor with length is not eliminated

Author: mnsaglamCreated Jan 22, 2023Updated Apr 13, 2026

Labelshelp wantedgood first issueP4feat

Consider the code:

javascript

/** @const {!Array<number>} */
const a = [1];

/** @const {!Array<number>} */
const b = Array(10);
b[0] = 2;

/** @const {!Array<number>} */
const c = [];
c.push(3);

/** @const {!Array<number>} */
const d = Array(10);
d.push(4);

When compiled with

bash

yarn google-closure-compiler -O ADVANCED --js a.js --rewrite_polyfills=false

we get

javascript

Array(10)[0]=2;Array(10).push(4);

Arrays created with the Array(len) constructor are not eliminated.

google-closure-compiler version: v20230103

Source: google/closure-compiler

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