| 88 | * @returns {Buffer[][]} unique chunk arrays |
| 89 | */ |
| 90 | const mapAndDeduplicateSourceBuffers = (input, fn) => { |
| 91 | /** @type {Map<number, Buffer[][]>} */ |
| 92 | const bySize = new Map(); |
| 93 | /** @type {Buffer[][]} */ |
| 94 | const result = []; |
| 95 | for (const value of input) { |
| 96 | const source = fn(value); |
| 97 | class="cm">// TODO webpack 6: drop the `buffers` check, require webpack-sources >= 3.4 |
| 98 | class="cm">// and call `source.buffers()` unconditionally. |
| 99 | const chunks = |
| 100 | class="cm">// TODO remove in webpack 6, this is protection against authors who directly use `webpack-sources` outdated version |
| 101 | typeof source.buffers === class="st">"function" |
| 102 | ? source.buffers() |
| 103 | : [source.buffer()]; |
| 104 | let total = 0; |
| 105 | for (const c of chunks) total += c.length; |
| 106 | const sameSize = bySize.get(total); |
| 107 | if (sameSize) { |
| 108 | let duplicate = false; |
| 109 | for (const other of sameSize) { |
| 110 | if (bufferArraysEqual(chunks, other)) { |
| 111 | duplicate = true; |
| 112 | break; |
| 113 | } |
| 114 | } |
| 115 | if (duplicate) continue; |
| 116 | sameSize.push(chunks); |
| 117 | } else { |
| 118 | bySize.set(total, [chunks]); |
| 119 | } |
| 120 | result.push(chunks); |
| 121 | } |
| 122 | return result; |
| 123 | }; |
| 124 | |
| 125 | /** |
| 126 | * Escapes regular expression metacharacters |