SWC may generate invalid source map when inputSourceMap is provided

[noyobo]

Describe the bug

https://stackblitz.com/~/github.com/noyobo/swc-issues

$ npm run build 

[Error: failed to read input source map from user-provided sourcemap

Caused by:
    bad reference to source #299] {
  code: 'GenericFailure'
}

Input code

No response

Config

import {transform} from '@swc/core';
import fs from "node:fs";

const fileCode = fs.readFileSync("./a.js", "utf-8");
const fileMap = fs.readFileSync("./a.js.map", "utf-8");
// valid check https://evanw.github.io/source-map-visualization/


// transformed successfully
const result = await transform(fileCode, {
  filename: 'a.js',
  sourceMaps: true,
  inputSourceMap: fileMap,
  jsc: {target: 'es5'},
  module: {type: "commonjs", strictMode: false},
})

// fs.writeFileSync("./a.transformed.js", result.code);
// fs.writeFileSync("./a.transformed.js.map", result.map);

// Using the result again to transform throws an error
// and verification failed in https://evanw.github.io/source-map-visualization/
await transform(result.code, {
  filename: "a.js",
  sourceMaps: true,
  inputSourceMap: result.map,
  module: {type: "commonjs", strictMode: false},
}).catch((e) => {
  /**
   * [Error: failed to read input source map from user-provided sourcemap
   *
   * Caused by:
   *     bad reference to source #299] {
   *   code: 'GenericFailure'
   * }
   */
  console.log(e);
});

Playground link (or link to the minimal reproduction)

https://stackblitz.com/~/github.com/noyobo/swc-issues

SWC Info output

No response

Expected behavior

The transformed sourceMap content can be used again

Actual behavior

No response

Version

1.4.11

Additional context

No response

[noyobo]

@kdy1 Is it fixed in v1.4.12? I tried to use 1.4.12 and the problem still exists.

https://stackblitz.com/~/github.com/noyobo/swc-issues

> npx -y swc-info@latest && node ./transform-a.mjs


    Operating System:
        Platform: linux
        Arch: x64
        Machine Type: undefined
        Version: Ubuntu 20.04.0 LTS Tue Apr 09 2024 10:36:06 GMT+0800 (中国标准时间)
        CPU: (3 cores)
            Models: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz

    Binaries:
        Node: 18.18.0
        npm: 10.2.3
        Yarn: 1.22.19
        pnpm: 8.15.3

    Relevant Packages:
        @swc/core: 1.4.12
        @swc/helpers: N/A
        @swc/types: N/A
        

    SWC Config:
        output: N/A
        .swcrc path: N/A

    Next.js info:
        output: N/A

failed to process js file

Caused by:
    0: failed to read input source map from user-provided sourcemap
    1: bad reference to source #299

[davidmurdoch]

Seeing the same when updating from 1.4.11 to 1.5.5.

Caused by:
    relative URL without a base
    at /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/swc-0.275.0/src/lib.rs:386

  ERROR  failed to read input source map: failed to parse inline source map url
index.js.map

[davidmurdoch]

My hunch is that this issue is caused by npm packages that include references to source maps (via //# sourceMappingURL=<some-file.js.map> comments) but omit the referenced source map files from the published package.

One example is @trezor/protobuf. They've got a semi-related issue: https://github.com/trezor/trezor-suite/issues/9334

[kdy1]

@davidmurdoch https://github.com/swc-project/swc/pull/8951 should fix your issue, although I'm not sure if it fixes this issue

[noyobo]

1.5.6 same

Sorry, I can't provide a smaller reproducible example yet, I don't know what boundary conditions are triggered.

[jd-carroll]

As an FYI - All of the errors we were seeing as a result of missing sourcemaps are not appearing. The sourcemaps are still not there, but we are at least not seeing those specific errors.

Thank you @kdy1!

[kdy1]

I'm working on this, and the failure happens at https://github.com/swc-project/swc/blob/54ac992781fa5a619ee1bcb9f097c3915276d9a3/crates/swc/src/lib.rs#L423-L425.

sourcemap::SourceMap::from_slice(s.as_bytes()) fails, which means the input source map is a wrong source map file. And I think error in an explicitly passed file should not be ignored.

[noyobo]

I added the babel transform process for comparison. From the results, it seems that babel's transform is always normal.

https://github.com/noyobo/swc-issues/blob/676db973ad2d5085adbb9e46188ae5c8a2a2a935/transform.mjs#L58

Using swc transform babelResult, I got a new error:

[Error: data did not match any variant of untagged enum InputSourceMap at line 1 column 2320758] {
  code: 'InvalidArg'
}

Babel transforms babelResult again and it passes

https://github.com/noyobo/swc-issues/blob/676db973ad2d5085adbb9e46188ae5c8a2a2a935/transform.mjs#L73

[kdy1]

It does not mean that the input source map is valid. babel may not validate the input source map before processing. Closing as the explicit input was wrong.

[noyobo]

ok, but invalid inputSourceMap is generated from first transform of swc. 😅

https://github.com/noyobo/swc-issues/blob/676db973ad2d5085adbb9e46188ae5c8a2a2a935/transform.mjs#L13~L27

I'll see if there are smaller examples later.

[kdy1]

My guess is that sourcemap uses a hashmap internally and that causes a problem for input source maps that have duplicate contents.

[crates/swc_common/src/source_map.rs:1223:13] orig.sources().count() = 300
[crates/swc_common/src/source_map.rs:1226:17] id = 0
[crates/swc_common/src/source_map.rs:1226:17] id = 1
[crates/swc_common/src/source_map.rs:1226:17] id = 2
[crates/swc_common/src/source_map.rs:1226:17] id = 3
[crates/swc_common/src/source_map.rs:1226:17] id = 4
[crates/swc_common/src/source_map.rs:1226:17] id = 5
[crates/swc_common/src/source_map.rs:1226:17] id = 6
[crates/swc_common/src/source_map.rs:1226:17] id = 7
[crates/swc_common/src/source_map.rs:1226:17] id = 8
[crates/swc_common/src/source_map.rs:1226:17] id = 9
[crates/swc_common/src/source_map.rs:1226:17] id = 10
[crates/swc_common/src/source_map.rs:1226:17] id = 11
[crates/swc_common/src/source_map.rs:1226:17] id = 12
[crates/swc_common/src/source_map.rs:1226:17] id = 13
[crates/swc_common/src/source_map.rs:1226:17] id = 14
[crates/swc_common/src/source_map.rs:1226:17] id = 15
[crates/swc_common/src/source_map.rs:1226:17] id = 16
[crates/swc_common/src/source_map.rs:1226:17] id = 17
[crates/swc_common/src/source_map.rs:1226:17] id = 18
[crates/swc_common/src/source_map.rs:1226:17] id = 19
[crates/swc_common/src/source_map.rs:1226:17] id = 20
[crates/swc_common/src/source_map.rs:1226:17] id = 21
[crates/swc_common/src/source_map.rs:1226:17] id = 22
[crates/swc_common/src/source_map.rs:1226:17] id = 23
[crates/swc_common/src/source_map.rs:1226:17] id = 24
[crates/swc_common/src/source_map.rs:1226:17] id = 25
[crates/swc_common/src/source_map.rs:1226:17] id = 26
[crates/swc_common/src/source_map.rs:1226:17] id = 27
[crates/swc_common/src/source_map.rs:1226:17] id = 28
[crates/swc_common/src/source_map.rs:1226:17] id = 29
[crates/swc_common/src/source_map.rs:1226:17] id = 30
[crates/swc_common/src/source_map.rs:1226:17] id = 31
[crates/swc_common/src/source_map.rs:1226:17] id = 32
[crates/swc_common/src/source_map.rs:1226:17] id = 33
[crates/swc_common/src/source_map.rs:1226:17] id = 34
[crates/swc_common/src/source_map.rs:1226:17] id = 35
[crates/swc_common/src/source_map.rs:1226:17] id = 36
[crates/swc_common/src/source_map.rs:1226:17] id = 37
[crates/swc_common/src/source_map.rs:1226:17] id = 38
[crates/swc_common/src/source_map.rs:1226:17] id = 39
[crates/swc_common/src/source_map.rs:1226:17] id = 40
[crates/swc_common/src/source_map.rs:1226:17] id = 41
[crates/swc_common/src/source_map.rs:1226:17] id = 42
[crates/swc_common/src/source_map.rs:1226:17] id = 43
[crates/swc_common/src/source_map.rs:1226:17] id = 44
[crates/swc_common/src/source_map.rs:1226:17] id = 45
[crates/swc_common/src/source_map.rs:1226:17] id = 46
[crates/swc_common/src/source_map.rs:1226:17] id = 47
[crates/swc_common/src/source_map.rs:1226:17] id = 48
[crates/swc_common/src/source_map.rs:1226:17] id = 49
[crates/swc_common/src/source_map.rs:1226:17] id = 50
[crates/swc_common/src/source_map.rs:1226:17] id = 51
[crates/swc_common/src/source_map.rs:1226:17] id = 52
[crates/swc_common/src/source_map.rs:1226:17] id = 53
[crates/swc_common/src/source_map.rs:1226:17] id = 54
[crates/swc_common/src/source_map.rs:1226:17] id = 55
[crates/swc_common/src/source_map.rs:1226:17] id = 56
[crates/swc_common/src/source_map.rs:1226:17] id = 57
[crates/swc_common/src/source_map.rs:1226:17] id = 58
[crates/swc_common/src/source_map.rs:1226:17] id = 59
[crates/swc_common/src/source_map.rs:1226:17] id = 60
[crates/swc_common/src/source_map.rs:1226:17] id = 61
[crates/swc_common/src/source_map.rs:1226:17] id = 62
[crates/swc_common/src/source_map.rs:1226:17] id = 63
[crates/swc_common/src/source_map.rs:1226:17] id = 64
[crates/swc_common/src/source_map.rs:1226:17] id = 65
[crates/swc_common/src/source_map.rs:1226:17] id = 66
[crates/swc_common/src/source_map.rs:1226:17] id = 67
[crates/swc_common/src/source_map.rs:1226:17] id = 68
[crates/swc_common/src/source_map.rs:1226:17] id = 69
[crates/swc_common/src/source_map.rs:1226:17] id = 70
[crates/swc_common/src/source_map.rs:1226:17] id = 71
[crates/swc_common/src/source_map.rs:1226:17] id = 72
[crates/swc_common/src/source_map.rs:1226:17] id = 73
[crates/swc_common/src/source_map.rs:1226:17] id = 74
[crates/swc_common/src/source_map.rs:1226:17] id = 75
[crates/swc_common/src/source_map.rs:1226:17] id = 76
[crates/swc_common/src/source_map.rs:1226:17] id = 77
[crates/swc_common/src/source_map.rs:1226:17] id = 78
[crates/swc_common/src/source_map.rs:1226:17] id = 79
[crates/swc_common/src/source_map.rs:1226:17] id = 80
[crates/swc_common/src/source_map.rs:1226:17] id = 81
[crates/swc_common/src/source_map.rs:1226:17] id = 82
[crates/swc_common/src/source_map.rs:1226:17] id = 83
[crates/swc_common/src/source_map.rs:1226:17] id = 84
[crates/swc_common/src/source_map.rs:1226:17] id = 85
[crates/swc_common/src/source_map.rs:1226:17] id = 86
[crates/swc_common/src/source_map.rs:1226:17] id = 87
[crates/swc_common/src/source_map.rs:1226:17] id = 88
[crates/swc_common/src/source_map.rs:1226:17] id = 89
[crates/swc_common/src/source_map.rs:1226:17] id = 90
[crates/swc_common/src/source_map.rs:1226:17] id = 91
[crates/swc_common/src/source_map.rs:1226:17] id = 92
[crates/swc_common/src/source_map.rs:1226:17] id = 93
[crates/swc_common/src/source_map.rs:1226:17] id = 94
[crates/swc_common/src/source_map.rs:1226:17] id = 95
[crates/swc_common/src/source_map.rs:1226:17] id = 96
[crates/swc_common/src/source_map.rs:1226:17] id = 97
[crates/swc_common/src/source_map.rs:1226:17] id = 98
[crates/swc_common/src/source_map.rs:1226:17] id = 99
[crates/swc_common/src/source_map.rs:1226:17] id = 100
[crates/swc_common/src/source_map.rs:1226:17] id = 101
[crates/swc_common/src/source_map.rs:1226:17] id = 102
[crates/swc_common/src/source_map.rs:1226:17] id = 103
[crates/swc_common/src/source_map.rs:1226:17] id = 104
[crates/swc_common/src/source_map.rs:1226:17] id = 105
[crates/swc_common/src/source_map.rs:1226:17] id = 106
[crates/swc_common/src/source_map.rs:1226:17] id = 107
[crates/swc_common/src/source_map.rs:1226:17] id = 108
[crates/swc_common/src/source_map.rs:1226:17] id = 109
[crates/swc_common/src/source_map.rs:1226:17] id = 110
[crates/swc_common/src/source_map.rs:1226:17] id = 111
[crates/swc_common/src/source_map.rs:1226:17] id = 112
[crates/swc_common/src/source_map.rs:1226:17] id = 113
[crates/swc_common/src/source_map.rs:1226:17] id = 114
[crates/swc_common/src/source_map.rs:1226:17] id = 115
[crates/swc_common/src/source_map.rs:1226:17] id = 116
[crates/swc_common/src/source_map.rs:1226:17] id = 117
[crates/swc_common/src/source_map.rs:1226:17] id = 118
[crates/swc_common/src/source_map.rs:1226:17] id = 119
[crates/swc_common/src/source_map.rs:1226:17] id = 120
[crates/swc_common/src/source_map.rs:1226:17] id = 121
[crates/swc_common/src/source_map.rs:1226:17] id = 122
[crates/swc_common/src/source_map.rs:1226:17] id = 123
[crates/swc_common/src/source_map.rs:1226:17] id = 124
[crates/swc_common/src/source_map.rs:1226:17] id = 125
[crates/swc_common/src/source_map.rs:1226:17] id = 126
[crates/swc_common/src/source_map.rs:1226:17] id = 127
[crates/swc_common/src/source_map.rs:1226:17] id = 128
[crates/swc_common/src/source_map.rs:1226:17] id = 129
[crates/swc_common/src/source_map.rs:1226:17] id = 130
[crates/swc_common/src/source_map.rs:1226:17] id = 131
[crates/swc_common/src/source_map.rs:1226:17] id = 132
[crates/swc_common/src/source_map.rs:1226:17] id = 133
[crates/swc_common/src/source_map.rs:1226:17] id = 134
[crates/swc_common/src/source_map.rs:1226:17] id = 135
[crates/swc_common/src/source_map.rs:1226:17] id = 136
[crates/swc_common/src/source_map.rs:1226:17] id = 137
[crates/swc_common/src/source_map.rs:1226:17] id = 138
[crates/swc_common/src/source_map.rs:1226:17] id = 139
[crates/swc_common/src/source_map.rs:1226:17] id = 140
[crates/swc_common/src/source_map.rs:1226:17] id = 141
[crates/swc_common/src/source_map.rs:1226:17] id = 142
[crates/swc_common/src/source_map.rs:1226:17] id = 143
[crates/swc_common/src/source_map.rs:1226:17] id = 144
[crates/swc_common/src/source_map.rs:1226:17] id = 145
[crates/swc_common/src/source_map.rs:1226:17] id = 146
[crates/swc_common/src/source_map.rs:1226:17] id = 147
[crates/swc_common/src/source_map.rs:1226:17] id = 148
[crates/swc_common/src/source_map.rs:1226:17] id = 149
[crates/swc_common/src/source_map.rs:1226:17] id = 150
[crates/swc_common/src/source_map.rs:1226:17] id = 151
[crates/swc_common/src/source_map.rs:1226:17] id = 152
[crates/swc_common/src/source_map.rs:1226:17] id = 153
[crates/swc_common/src/source_map.rs:1226:17] id = 154
[crates/swc_common/src/source_map.rs:1226:17] id = 155
[crates/swc_common/src/source_map.rs:1226:17] id = 156
[crates/swc_common/src/source_map.rs:1226:17] id = 157
[crates/swc_common/src/source_map.rs:1226:17] id = 158
[crates/swc_common/src/source_map.rs:1226:17] id = 159
[crates/swc_common/src/source_map.rs:1226:17] id = 160
[crates/swc_common/src/source_map.rs:1226:17] id = 161
[crates/swc_common/src/source_map.rs:1226:17] id = 162
[crates/swc_common/src/source_map.rs:1226:17] id = 163
[crates/swc_common/src/source_map.rs:1226:17] id = 164
[crates/swc_common/src/source_map.rs:1226:17] id = 165
[crates/swc_common/src/source_map.rs:1226:17] id = 166
[crates/swc_common/src/source_map.rs:1226:17] id = 167
[crates/swc_common/src/source_map.rs:1226:17] id = 168
[crates/swc_common/src/source_map.rs:1226:17] id = 169
[crates/swc_common/src/source_map.rs:1226:17] id = 170
[crates/swc_common/src/source_map.rs:1226:17] id = 171
[crates/swc_common/src/source_map.rs:1226:17] id = 172
[crates/swc_common/src/source_map.rs:1226:17] id = 173
[crates/swc_common/src/source_map.rs:1226:17] id = 174
[crates/swc_common/src/source_map.rs:1226:17] id = 175
[crates/swc_common/src/source_map.rs:1226:17] id = 176
[crates/swc_common/src/source_map.rs:1226:17] id = 177
[crates/swc_common/src/source_map.rs:1226:17] id = 178
[crates/swc_common/src/source_map.rs:1226:17] id = 179
[crates/swc_common/src/source_map.rs:1226:17] id = 180
[crates/swc_common/src/source_map.rs:1226:17] id = 181
[crates/swc_common/src/source_map.rs:1226:17] id = 182
[crates/swc_common/src/source_map.rs:1226:17] id = 183
[crates/swc_common/src/source_map.rs:1226:17] id = 184
[crates/swc_common/src/source_map.rs:1226:17] id = 185
[crates/swc_common/src/source_map.rs:1226:17] id = 186
[crates/swc_common/src/source_map.rs:1226:17] id = 187
[crates/swc_common/src/source_map.rs:1226:17] id = 188
[crates/swc_common/src/source_map.rs:1226:17] id = 189
[crates/swc_common/src/source_map.rs:1226:17] id = 190
[crates/swc_common/src/source_map.rs:1226:17] id = 191
[crates/swc_common/src/source_map.rs:1226:17] id = 192
[crates/swc_common/src/source_map.rs:1226:17] id = 193
[crates/swc_common/src/source_map.rs:1226:17] id = 194
[crates/swc_common/src/source_map.rs:1226:17] id = 195
[crates/swc_common/src/source_map.rs:1226:17] id = 196
[crates/swc_common/src/source_map.rs:1226:17] id = 197
[crates/swc_common/src/source_map.rs:1226:17] id = 198
[crates/swc_common/src/source_map.rs:1226:17] id = 199
[crates/swc_common/src/source_map.rs:1226:17] id = 200
[crates/swc_common/src/source_map.rs:1226:17] id = 201
[crates/swc_common/src/source_map.rs:1226:17] id = 192
[crates/swc_common/src/source_map.rs:1226:17] id = 202
[crates/swc_common/src/source_map.rs:1226:17] id = 203
[crates/swc_common/src/source_map.rs:1226:17] id = 204
[crates/swc_common/src/source_map.rs:1226:17] id = 205
[crates/swc_common/src/source_map.rs:1226:17] id = 206
[crates/swc_common/src/source_map.rs:1226:17] id = 207
[crates/swc_common/src/source_map.rs:1226:17] id = 208
[crates/swc_common/src/source_map.rs:1226:17] id = 209
[crates/swc_common/src/source_map.rs:1226:17] id = 210
[crates/swc_common/src/source_map.rs:1226:17] id = 211
[crates/swc_common/src/source_map.rs:1226:17] id = 212
[crates/swc_common/src/source_map.rs:1226:17] id = 213
[crates/swc_common/src/source_map.rs:1226:17] id = 214
[crates/swc_common/src/source_map.rs:1226:17] id = 215
[crates/swc_common/src/source_map.rs:1226:17] id = 216
[crates/swc_common/src/source_map.rs:1226:17] id = 217
[crates/swc_common/src/source_map.rs:1226:17] id = 218
[crates/swc_common/src/source_map.rs:1226:17] id = 219
[crates/swc_common/src/source_map.rs:1226:17] id = 220
[crates/swc_common/src/source_map.rs:1226:17] id = 221
[crates/swc_common/src/source_map.rs:1226:17] id = 222
[crates/swc_common/src/source_map.rs:1226:17] id = 223
[crates/swc_common/src/source_map.rs:1226:17] id = 224
[crates/swc_common/src/source_map.rs:1226:17] id = 225
[crates/swc_common/src/source_map.rs:1226:17] id = 226
[crates/swc_common/src/source_map.rs:1226:17] id = 227
[crates/swc_common/src/source_map.rs:1226:17] id = 228
[crates/swc_common/src/source_map.rs:1226:17] id = 229
[crates/swc_common/src/source_map.rs:1226:17] id = 230
[crates/swc_common/src/source_map.rs:1226:17] id = 231
[crates/swc_common/src/source_map.rs:1226:17] id = 232
[crates/swc_common/src/source_map.rs:1226:17] id = 233
[crates/swc_common/src/source_map.rs:1226:17] id = 234
[crates/swc_common/src/source_map.rs:1226:17] id = 235
[crates/swc_common/src/source_map.rs:1226:17] id = 236
[crates/swc_common/src/source_map.rs:1226:17] id = 237
[crates/swc_common/src/source_map.rs:1226:17] id = 238
[crates/swc_common/src/source_map.rs:1226:17] id = 239
[crates/swc_common/src/source_map.rs:1226:17] id = 240
[crates/swc_common/src/source_map.rs:1226:17] id = 241
[crates/swc_common/src/source_map.rs:1226:17] id = 242
[crates/swc_common/src/source_map.rs:1226:17] id = 243
[crates/swc_common/src/source_map.rs:1226:17] id = 244
[crates/swc_common/src/source_map.rs:1226:17] id = 245
[crates/swc_common/src/source_map.rs:1226:17] id = 246
[crates/swc_common/src/source_map.rs:1226:17] id = 247
[crates/swc_common/src/source_map.rs:1226:17] id = 248
[crates/swc_common/src/source_map.rs:1226:17] id = 249
[crates/swc_common/src/source_map.rs:1226:17] id = 250
[crates/swc_common/src/source_map.rs:1226:17] id = 251
[crates/swc_common/src/source_map.rs:1226:17] id = 252
[crates/swc_common/src/source_map.rs:1226:17] id = 253
[crates/swc_common/src/source_map.rs:1226:17] id = 254
[crates/swc_common/src/source_map.rs:1226:17] id = 255
[crates/swc_common/src/source_map.rs:1226:17] id = 256
[crates/swc_common/src/source_map.rs:1226:17] id = 257
[crates/swc_common/src/source_map.rs:1226:17] id = 258
[crates/swc_common/src/source_map.rs:1226:17] id = 259
[crates/swc_common/src/source_map.rs:1226:17] id = 260
[crates/swc_common/src/source_map.rs:1226:17] id = 261
[crates/swc_common/src/source_map.rs:1226:17] id = 262
[crates/swc_common/src/source_map.rs:1226:17] id = 263
[crates/swc_common/src/source_map.rs:1226:17] id = 264
[crates/swc_common/src/source_map.rs:1226:17] id = 265
[crates/swc_common/src/source_map.rs:1226:17] id = 266
[crates/swc_common/src/source_map.rs:1226:17] id = 267
[crates/swc_common/src/source_map.rs:1226:17] id = 268
[crates/swc_common/src/source_map.rs:1226:17] id = 269
[crates/swc_common/src/source_map.rs:1226:17] id = 270
[crates/swc_common/src/source_map.rs:1226:17] id = 271
[crates/swc_common/src/source_map.rs:1226:17] id = 272
[crates/swc_common/src/source_map.rs:1226:17] id = 273
[crates/swc_common/src/source_map.rs:1226:17] id = 274
[crates/swc_common/src/source_map.rs:1226:17] id = 275
[crates/swc_common/src/source_map.rs:1226:17] id = 276
[crates/swc_common/src/source_map.rs:1226:17] id = 277
[crates/swc_common/src/source_map.rs:1226:17] id = 278
[crates/swc_common/src/source_map.rs:1226:17] id = 279
[crates/swc_common/src/source_map.rs:1226:17] id = 280
[crates/swc_common/src/source_map.rs:1226:17] id = 281
[crates/swc_common/src/source_map.rs:1226:17] id = 282
[crates/swc_common/src/source_map.rs:1226:17] id = 283
[crates/swc_common/src/source_map.rs:1226:17] id = 284
[crates/swc_common/src/source_map.rs:1226:17] id = 285
[crates/swc_common/src/source_map.rs:1226:17] id = 286
[crates/swc_common/src/source_map.rs:1226:17] id = 287
[crates/swc_common/src/source_map.rs:1226:17] id = 288
[crates/swc_common/src/source_map.rs:1226:17] id = 289
[crates/swc_common/src/source_map.rs:1226:17] id = 290
[crates/swc_common/src/source_map.rs:1226:17] id = 291
[crates/swc_common/src/source_map.rs:1226:17] id = 292
[crates/swc_common/src/source_map.rs:1226:17] id = 293
[crates/swc_common/src/source_map.rs:1226:17] id = 294
[crates/swc_common/src/source_map.rs:1226:17] id = 295
[crates/swc_common/src/source_map.rs:1226:17] id = 296
[crates/swc_common/src/source_map.rs:1226:17] id = 297
[crates/swc_common/src/source_map.rs:1226:17] id = 298

[kdy1]

[crates/swc_common/src/source_map.rs:1226:17] id = 201
[crates/swc_common/src/source_map.rs:1226:17] id = 192

[kdy1]

                if id == 192 {
                    dbg!(src);
                }

[crates/swc_common/src/source_map.rs:1231:21] src = "/Users/noyobo/home/gitlab/tuya-public/illuminate-base-mp/dist/../dist/src/components.ts"

[kdy1]

Yeap it was the cause

[kdy1]

I left https://github.com/getsentry/rust-sourcemap/issues/89

[potench]

Something in v1.4.12 (and still present in v7.22.8) of @swc-project/swc is causing the following error when targeting es5 + sourcemap: true

Caused by:
    relative URL without a base
    at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/swc-0.282.3/src/lib.rs:407

  ERROR  failed to read input source map: failed to parse inline source map url out.js.map

In my case, I'm using tsup; my options currently are:

1. Downgrade to @swc/core/1.v.4.11
2. Disable sourcemap: false in tsup.config.ts
3. Or change to target: es6 in tsup.config.ts

After looking at this a bit more, a minimal reproduction looks like this

npm init
npm install @swc/[email protected] [email protected] [email protected] --save-dev
# create a file to build
echo "export default () => console.log('hello world');" > index.ts
# remove dist and tsup it 
rm -rf ./dist/ && npx tsup --sourcemap --treeshake --target es5 ./index.ts 
# results in error 
# > ERROR  failed to read input source map: failed to parse inline source map url 

It looks like there's a race condition. If you run again and ./dist already has the output, then it will not fail

[kdy1]

https://github.com/getsentry/rust-sourcemap/pull/91 is still not merged/published so it's expected

[noyobo]

Wait?, I tested version 1.7.7-nightly-20240806.4, and it just didn't report an error. But the generated sourcemap seems to be unavailable

1. Use swc transform a.js & a.js.map

console.log('==== use swc transform es6 to es5 ====');
// transformed successfully
const result = await transform(fileCode, {
  filename: 'a.js',
  sourceMaps: true,
  inputSourceMap: fileMap,
  jsc: { target: 'es5' },
  minify: true,
  module: { type: 'commonjs', strictMode: false },
});

fs.writeFileSync('./a.swc.js', result.code);
fs.writeFileSync('./a.swc.js.map', result.map);

2. Validate transformed sourcemap

const fs = require('fs');
const path = require('path');
const { SourceMapConsumer } = require('source-map'); // 0.7.4

async function verifySourcemap({ file, map, offset, line }) {
  const sourceMap = fs.readFileSync(map, 'utf8');
  const consumer = await new SourceMapConsumer(sourceMap);
  const originalPosition = consumer.originalPositionFor({
    line: line,
    column: offset,
  });
  if (originalPosition.source === null) {
    // @swc/core@nightly always return null for source
    return null;
  }
  let miniCode = fs.readFileSync(file, 'utf8');
  miniCode = miniCode.split('\n')[line - 1];
  miniCode = miniCode.substring(offset - 20, offset + 20);

  const source = consumer.sourceContentFor(originalPosition.source);
  const code = source.split('\n')[originalPosition.line - 1];

  // 1.7.6  that works
  return { sourceFile: originalPosition.source, code, miniCode };
}

verifySourcemap({
  file: path.join(__dirname, 'a.swc.js'),
  map: path.join(__dirname, 'a.swc.js.map'),
  line: 1,
  offset: 207274,
}).then((result) => {
  console.log('swc:', result);
});

Is this a new problem?

[kdy1]

Yes, please file another issue

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.