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module: fix crash on multiline named cjs imports #35275

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module: fix crash on multiline named cjs imports #35275

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@ctavan ctavan commented Sep 20, 2020

The node process crashes when trying to parse a multiline import
statement for named exports of a CommonJS module:

TypeError: Cannot read property '0' of null
      at ModuleJob._instantiate (internal/modules/esm/module_job.js:112:77)
      at async ModuleJob.run (internal/modules/esm/module_job.js:137:5)
      at async Loader.import (internal/modules/esm/loader.js:165:24)
      at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
      at async waitForActual (assert.js:721:5)
      at async rejects (assert.js:830:25),

The reason is that the regexp that is currently used to decorate the
original error fails for multi line import statements.

Unfortunately the undecorated error stack only contains the single line
which causes the import to fail:

file:///***/node/test/fixtures/es-modules/package-cjs-named-error/multi-line.mjs:2
  comeOn,
  ^^^^^^
SyntaxError: The requested module './fail.cjs' does not provide an export named 'comeOn'
    at ModuleJob._instantiate (internal/modules/esm/module_job.js:98:21)
    at async ModuleJob.run (internal/modules/esm/module_job.js:141:5)
    at async Loader.import (internal/modules/esm/loader.js:165:24)
    at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
    at async waitForActual (assert.js:721:5)
    at async rejects (assert.js:830:25)

Hence, for multiline import statements we cannot create an equivalent
piece of code that uses default import followed by an object
destructuring assignment.

In any case the node process should definitely not crash. So until we
have a more sophisticated way of extracting the entire problematic
multiline import statement, show the code example only for single-line
imports where the current regexp approach works well.

Refs: #35259

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

@nodejs-github-bot nodejs-github-bot added the esm Issues and PRs related to the ECMAScript Modules implementation. label Sep 20, 2020
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  • @nodejs/modules

mcollina
mcollina approved these changes Sep 20, 2020
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lgtm

@addaleax addaleax added author ready PRs that have at least one approval, no pending requests for changes, and a CI started. request-ci Add this label to start a Jenkins CI on a PR. labels Sep 20, 2020
@github-actions github-actions bot removed the request-ci Add this label to start a Jenkins CI on a PR. label Sep 20, 2020
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CI: https://ci.nodejs.org/job/node-test-pull-request/33172/

MylesBorins
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LGTM

tiny nit with the test to keep with the homestar runner theme, no need to land it 🤣

test/fixtures/es-modules/package-cjs-named-error/fail.cjs Outdated Show resolved Hide resolved
test/fixtures/es-modules/package-cjs-named-error/multi-line.mjs Outdated Show resolved Hide resolved
ctavan and others added 3 commits September 20, 2020 23:21
@ctavan
module: fix crash on multiline named cjs imports
6298277 
The node process crashes when trying to parse a multiline import
statement for named exports of a CommonJS module:

    TypeError: Cannot read property '0' of null
          at ModuleJob._instantiate (internal/modules/esm/module_job.js:112:77)
          at async ModuleJob.run (internal/modules/esm/module_job.js:137:5)
          at async Loader.import (internal/modules/esm/loader.js:165:24)
          at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
          at async waitForActual (assert.js:721:5)
          at async rejects (assert.js:830:25),

The reason is that the regexp that is currently used to decorate the
original error fails for multi line import statements.

Unfortunately the undecorated error stack only contains the single line
which causes the import to fail:

    file:///***/node/test/fixtures/es-modules/package-cjs-named-error/multi-line.mjs:2
      comeOn,
      ^^^^^^
    SyntaxError: The requested module './fail.cjs' does not provide an export named 'comeOn'
        at ModuleJob._instantiate (internal/modules/esm/module_job.js:98:21)
        at async ModuleJob.run (internal/modules/esm/module_job.js:141:5)
        at async Loader.import (internal/modules/esm/loader.js:165:24)
        at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
        at async waitForActual (assert.js:721:5)
        at async rejects (assert.js:830:25)

Hence, for multiline import statements we cannot create an equivalent
piece of code that uses default import followed by an object
destructuring assignment.

In any case the node process should definitely not crash. So until we
have a more sophisticated way of extracting the entire problematic
multiline import statement, show the code example only for single-line
imports where the current regexp approach works well.

Refs: nodejs#35259
@ctavan @MylesBorins
Update test/fixtures/es-modules/package-cjs-named-error/fail.cjs
e0febda 
Co-authored-by: Myles Borins <mylesborins@github.com>
@ctavan @MylesBorins
Update test/fixtures/es-modules/package-cjs-named-error/multi-line.mjs
af3b991 
Co-authored-by: Myles Borins <mylesborins@github.com>
@ctavan ctavan force-pushed the fix-multiline-named-imports-of-cjs branch from e311be4 to af3b991 Compare September 20, 2020 21:22
@Trott Trott added request-ci Add this label to start a Jenkins CI on a PR. and removed request-ci Add this label to start a Jenkins CI on a PR. labels Sep 22, 2020
@github-actions github-actions bot removed the request-ci Add this label to start a Jenkins CI on a PR. label Sep 22, 2020
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CI: https://ci.nodejs.org/job/node-test-pull-request/33189/

MylesBorins pushed a commit that referenced this pull request Sep 22, 2020
@ctavan @MylesBorins
module: fix crash on multiline named cjs imports
219e9fe 
The node process crashes when trying to parse a multiline import
statement for named exports of a CommonJS module:

    TypeError: Cannot read property '0' of null
          at ModuleJob._instantiate (internal/modules/esm/module_job.js:112:77)
          at async ModuleJob.run (internal/modules/esm/module_job.js:137:5)
          at async Loader.import (internal/modules/esm/loader.js:165:24)
          at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
          at async waitForActual (assert.js:721:5)
          at async rejects (assert.js:830:25),

The reason is that the regexp that is currently used to decorate the
original error fails for multi line import statements.

Unfortunately the undecorated error stack only contains the single line
which causes the import to fail:

    file:///***/node/test/fixtures/es-modules/package-cjs-named-error/multi-line.mjs:2
      comeOn,
      ^^^^^^
    SyntaxError: The requested module './fail.cjs' does not provide an export named 'comeOn'
        at ModuleJob._instantiate (internal/modules/esm/module_job.js:98:21)
        at async ModuleJob.run (internal/modules/esm/module_job.js:141:5)
        at async Loader.import (internal/modules/esm/loader.js:165:24)
        at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
        at async waitForActual (assert.js:721:5)
        at async rejects (assert.js:830:25)

Hence, for multiline import statements we cannot create an equivalent
piece of code that uses default import followed by an object
destructuring assignment.

In any case the node process should definitely not crash. So until we
have a more sophisticated way of extracting the entire problematic
multiline import statement, show the code example only for single-line
imports where the current regexp approach works well.

Refs: #35259

PR-URL: #35275
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
@MylesBorins
Copy link
Member

Landed in 219e9fe

MylesBorins pushed a commit that referenced this pull request Sep 24, 2020
@ctavan @MylesBorins
module: fix crash on multiline named cjs imports
68ea7f5 
The node process crashes when trying to parse a multiline import
statement for named exports of a CommonJS module:

    TypeError: Cannot read property '0' of null
          at ModuleJob._instantiate (internal/modules/esm/module_job.js:112:77)
          at async ModuleJob.run (internal/modules/esm/module_job.js:137:5)
          at async Loader.import (internal/modules/esm/loader.js:165:24)
          at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
          at async waitForActual (assert.js:721:5)
          at async rejects (assert.js:830:25),

The reason is that the regexp that is currently used to decorate the
original error fails for multi line import statements.

Unfortunately the undecorated error stack only contains the single line
which causes the import to fail:

    file:///***/node/test/fixtures/es-modules/package-cjs-named-error/multi-line.mjs:2
      comeOn,
      ^^^^^^
    SyntaxError: The requested module './fail.cjs' does not provide an export named 'comeOn'
        at ModuleJob._instantiate (internal/modules/esm/module_job.js:98:21)
        at async ModuleJob.run (internal/modules/esm/module_job.js:141:5)
        at async Loader.import (internal/modules/esm/loader.js:165:24)
        at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
        at async waitForActual (assert.js:721:5)
        at async rejects (assert.js:830:25)

Hence, for multiline import statements we cannot create an equivalent
piece of code that uses default import followed by an object
destructuring assignment.

In any case the node process should definitely not crash. So until we
have a more sophisticated way of extracting the entire problematic
multiline import statement, show the code example only for single-line
imports where the current regexp approach works well.

Refs: #35259

PR-URL: #35275
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
guybedford pushed a commit to guybedford/node that referenced this pull request Sep 28, 2020
@ctavan @guybedford
module: fix crash on multiline named cjs imports
0772b5b 
The node process crashes when trying to parse a multiline import
statement for named exports of a CommonJS module:

    TypeError: Cannot read property '0' of null
          at ModuleJob._instantiate (internal/modules/esm/module_job.js:112:77)
          at async ModuleJob.run (internal/modules/esm/module_job.js:137:5)
          at async Loader.import (internal/modules/esm/loader.js:165:24)
          at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
          at async waitForActual (assert.js:721:5)
          at async rejects (assert.js:830:25),

The reason is that the regexp that is currently used to decorate the
original error fails for multi line import statements.

Unfortunately the undecorated error stack only contains the single line
which causes the import to fail:

    file:///***/node/test/fixtures/es-modules/package-cjs-named-error/multi-line.mjs:2
      comeOn,
      ^^^^^^
    SyntaxError: The requested module './fail.cjs' does not provide an export named 'comeOn'
        at ModuleJob._instantiate (internal/modules/esm/module_job.js:98:21)
        at async ModuleJob.run (internal/modules/esm/module_job.js:141:5)
        at async Loader.import (internal/modules/esm/loader.js:165:24)
        at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
        at async waitForActual (assert.js:721:5)
        at async rejects (assert.js:830:25)

Hence, for multiline import statements we cannot create an equivalent
piece of code that uses default import followed by an object
destructuring assignment.

In any case the node process should definitely not crash. So until we
have a more sophisticated way of extracting the entire problematic
multiline import statement, show the code example only for single-line
imports where the current regexp approach works well.

Refs: nodejs#35259

PR-URL: nodejs#35275
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
@MylesBorins MylesBorins mentioned this pull request Sep 29, 2020
Merged
codebytere pushed a commit that referenced this pull request Oct 1, 2020
@ctavan @codebytere
module: fix crash on multiline named cjs imports
ed3278d 
The node process crashes when trying to parse a multiline import
statement for named exports of a CommonJS module:

    TypeError: Cannot read property '0' of null
          at ModuleJob._instantiate (internal/modules/esm/module_job.js:112:77)
          at async ModuleJob.run (internal/modules/esm/module_job.js:137:5)
          at async Loader.import (internal/modules/esm/loader.js:165:24)
          at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
          at async waitForActual (assert.js:721:5)
          at async rejects (assert.js:830:25),

The reason is that the regexp that is currently used to decorate the
original error fails for multi line import statements.

Unfortunately the undecorated error stack only contains the single line
which causes the import to fail:

    file:///***/node/test/fixtures/es-modules/package-cjs-named-error/multi-line.mjs:2
      comeOn,
      ^^^^^^
    SyntaxError: The requested module './fail.cjs' does not provide an export named 'comeOn'
        at ModuleJob._instantiate (internal/modules/esm/module_job.js:98:21)
        at async ModuleJob.run (internal/modules/esm/module_job.js:141:5)
        at async Loader.import (internal/modules/esm/loader.js:165:24)
        at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
        at async waitForActual (assert.js:721:5)
        at async rejects (assert.js:830:25)

Hence, for multiline import statements we cannot create an equivalent
piece of code that uses default import followed by an object
destructuring assignment.

In any case the node process should definitely not crash. So until we
have a more sophisticated way of extracting the entire problematic
multiline import statement, show the code example only for single-line
imports where the current regexp approach works well.

Refs: #35259

PR-URL: #35275
Backport-PR-URL: #35385
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
@ctavan ctavan mentioned this pull request Oct 1, 2020
Closed
3 tasks
@codebytere codebytere mentioned this pull request Oct 4, 2020
Merged
ctavan added a commit to ctavan/node that referenced this pull request Oct 16, 2020
@ctavan
module: improve named cjs import errors
3352205 
When trying to import named exports from a CommonJS module an error is
thrown. Unfortunately the V8 error only contains the single line that
causes the error, it is therefore impossible to construct an equivalent
code consisting of default import + object descructuring assignment.

This was the reason why the example code was removed for multi line
import statements in nodejs#35275

To generate a helpful error messages for any case we can parse the file
where the error happens using acorn and construct a valid example code
from the parsed ImportDeclaration. This will work for _any_ valid import
statement.

Since this code is only executed shortly before the node process crashes
anyways performance should not be a concern here.

Fixes: nodejs#35259
Refs: nodejs#35275
joesepi pushed a commit to joesepi/node that referenced this pull request Jan 8, 2021
@ctavan @joesepi
module: fix crash on multiline named cjs imports
5da392c 
The node process crashes when trying to parse a multiline import
statement for named exports of a CommonJS module:

    TypeError: Cannot read property '0' of null
          at ModuleJob._instantiate (internal/modules/esm/module_job.js:112:77)
          at async ModuleJob.run (internal/modules/esm/module_job.js:137:5)
          at async Loader.import (internal/modules/esm/loader.js:165:24)
          at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
          at async waitForActual (assert.js:721:5)
          at async rejects (assert.js:830:25),

The reason is that the regexp that is currently used to decorate the
original error fails for multi line import statements.

Unfortunately the undecorated error stack only contains the single line
which causes the import to fail:

    file:///***/node/test/fixtures/es-modules/package-cjs-named-error/multi-line.mjs:2
      comeOn,
      ^^^^^^
    SyntaxError: The requested module './fail.cjs' does not provide an export named 'comeOn'
        at ModuleJob._instantiate (internal/modules/esm/module_job.js:98:21)
        at async ModuleJob.run (internal/modules/esm/module_job.js:141:5)
        at async Loader.import (internal/modules/esm/loader.js:165:24)
        at async rejects.name (file:///***/node/test/es-module/test-esm-cjs-named-error.mjs:56:3)
        at async waitForActual (assert.js:721:5)
        at async rejects (assert.js:830:25)

Hence, for multiline import statements we cannot create an equivalent
piece of code that uses default import followed by an object
destructuring assignment.

In any case the node process should definitely not crash. So until we
have a more sophisticated way of extracting the entire problematic
multiline import statement, show the code example only for single-line
imports where the current regexp approach works well.

Refs: nodejs#35259

PR-URL: nodejs#35275
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
ctavan added a commit to ctavan/node that referenced this pull request Jan 29, 2021
@ctavan
module: improve named cjs import errors
22f700c 
When trying to import named exports from a CommonJS module an error is
thrown. Unfortunately the V8 error only contains the single line that
causes the error, it is therefore impossible to construct an equivalent
code consisting of default import + object descructuring assignment.

This was the reason why the example code was removed for multi line
import statements in nodejs#35275

To generate a helpful error messages for any case we can parse the file
where the error happens using acorn and construct a valid example code
from the parsed ImportDeclaration. This will work for _any_ valid import
statement.

Since this code is only executed shortly before the node process crashes
anyways performance should not be a concern here.

Fixes: nodejs#35259
Refs: nodejs#35275
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@mcollina mcollina mcollina approved these changes

@MylesBorins MylesBorins MylesBorins approved these changes

@Trott Trott Trott approved these changes

@addaleax addaleax addaleax approved these changes

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