'loc' of null error when using babel-eslint as a custom parser

[Robula]

• Node Version: 8.9.1
• eslint Version: 4.10.0
• vue-eslint-parser Version: 2.0.1-beta.2
• babel-eslint Version: 8.0.2

This is directly related to the issue I created here vuejs/eslint-plugin-vue#189.

I have discovered that the above issue is not resident in eslint-plugin-vue and that the issue likely lies with the interactions between babel-eslint and vue-eslint-parser.

As described in vuejs/eslint-plugin-vue#189 the combination of vue-eslint-parser and babel-eslint produces a error when running the linter.

Example

[mysticatea]

Thank you for the report.

Hmmm, but I still cannot reproduce it. I'm seeing no errors.

[Robula]

@mysticatea Could you try changing @Component() to

@Component({
    mounted: {}
})

and rerun the linter please?

[mysticatea]

Sure, but I got the same result.

Could you run npm ls and share the result?

[mysticatea]

This is mine

sandbox@1.0.0 C:\Users\t-nagashima.MSS\dev\sandbox
+-- babel-eslint@8.0.2
| +-- @babel/code-frame@7.0.0-beta.31
| | +-- chalk@2.3.0 deduped
| | +-- esutils@2.0.2 deduped
| | `-- js-tokens@3.0.2
| +-- @babel/traverse@7.0.0-beta.31
| | +-- @babel/code-frame@7.0.0-beta.31 deduped
| | +-- @babel/helper-function-name@7.0.0-beta.31
| | | +-- @babel/helper-get-function-arity@7.0.0-beta.31
| | | | `-- @babel/types@7.0.0-beta.31 deduped
| | | +-- @babel/template@7.0.0-beta.31
| | | | +-- @babel/code-frame@7.0.0-beta.31 deduped
| | | | +-- @babel/types@7.0.0-beta.31 deduped
| | | | +-- babylon@7.0.0-beta.31 deduped
| | | | `-- lodash@4.17.4 deduped
| | | +-- @babel/traverse@7.0.0-beta.31 deduped
| | | `-- @babel/types@7.0.0-beta.31 deduped
| | +-- @babel/types@7.0.0-beta.31 deduped
| | +-- babylon@7.0.0-beta.31 deduped
| | +-- debug@3.1.0 deduped
| | +-- globals@10.3.0
| | +-- invariant@2.2.2
| | | `-- loose-envify@1.3.1
| | |   `-- js-tokens@3.0.2 deduped
| | `-- lodash@4.17.4 deduped
| +-- @babel/types@7.0.0-beta.31
| | +-- esutils@2.0.2 deduped
| | +-- lodash@4.17.4 deduped
| | `-- to-fast-properties@2.0.0
| `-- babylon@7.0.0-beta.31
+-- eslint@4.11.0
| +-- ajv@5.3.0
| | +-- co@4.6.0
| | +-- fast-deep-equal@1.0.0
| | +-- fast-json-stable-stringify@2.0.0
| | `-- json-schema-traverse@0.3.1
| +-- babel-code-frame@6.26.0
| | +-- chalk@1.1.3
| | | +-- ansi-styles@2.2.1
| | | +-- escape-string-regexp@1.0.5 deduped
| | | +-- has-ansi@2.0.0
| | | | `-- ansi-regex@2.1.1 deduped
| | | +-- strip-ansi@3.0.1
| | | | `-- ansi-regex@2.1.1
| | | `-- supports-color@2.0.0
| | +-- esutils@2.0.2 deduped
| | `-- js-tokens@3.0.2 deduped
| +-- chalk@2.3.0
| | +-- ansi-styles@3.2.0
| | | `-- color-convert@1.9.1
| | |   `-- color-name@1.1.3
| | +-- escape-string-regexp@1.0.5
| | `-- supports-color@4.5.0
| |   `-- has-flag@2.0.0
| +-- concat-stream@1.6.0
| | +-- inherits@2.0.3
| | +-- readable-stream@2.3.3
| | | +-- core-util-is@1.0.2
| | | +-- inherits@2.0.3 deduped
| | | +-- isarray@1.0.0 deduped
| | | +-- process-nextick-args@1.0.7
| | | +-- safe-buffer@5.1.1
| | | +-- string_decoder@1.0.3
| | | | `-- safe-buffer@5.1.1 deduped
| | | `-- util-deprecate@1.0.2
| | `-- typedarray@0.0.6
| +-- cross-spawn@5.1.0
| | +-- lru-cache@4.1.1
| | | +-- pseudomap@1.0.2
| | | `-- yallist@2.1.2
| | +-- shebang-command@1.2.0
| | | `-- shebang-regex@1.0.0
| | `-- which@1.3.0
| |   `-- isexe@2.0.0
| +-- debug@3.1.0
| | `-- ms@2.0.0
| +-- doctrine@2.0.0
| | +-- esutils@2.0.2 deduped
| | `-- isarray@1.0.0
| +-- eslint-scope@3.7.1
| | +-- esrecurse@4.2.0
| | | +-- estraverse@4.2.0 deduped
| | | `-- object-assign@4.1.1 deduped
| | `-- estraverse@4.2.0 deduped
| +-- espree@3.5.2
| | +-- acorn@5.2.1
| | `-- acorn-jsx@3.0.1
| |   `-- acorn@3.3.0
| +-- esquery@1.0.0
| | `-- estraverse@4.2.0 deduped
| +-- estraverse@4.2.0
| +-- esutils@2.0.2
| +-- file-entry-cache@2.0.0
| | +-- flat-cache@1.3.0
| | | +-- circular-json@0.3.3
| | | +-- del@2.2.2
| | | | +-- globby@5.0.0
| | | | | +-- array-union@1.0.2
| | | | | | `-- array-uniq@1.0.3
| | | | | +-- arrify@1.0.1
| | | | | +-- glob@7.1.2 deduped
| | | | | +-- object-assign@4.1.1 deduped
| | | | | +-- pify@2.3.0 deduped
| | | | | `-- pinkie-promise@2.0.1 deduped
| | | | +-- is-path-cwd@1.0.0
| | | | +-- is-path-in-cwd@1.0.0
| | | | | `-- is-path-inside@1.0.0
| | | | |   `-- path-is-inside@1.0.2 deduped
| | | | +-- object-assign@4.1.1 deduped
| | | | +-- pify@2.3.0
| | | | +-- pinkie-promise@2.0.1
| | | | | `-- pinkie@2.0.4
| | | | `-- rimraf@2.6.2
| | | |   `-- glob@7.1.2 deduped
| | | +-- graceful-fs@4.1.11
| | | `-- write@0.2.1
| | |   `-- mkdirp@0.5.1 deduped
| | `-- object-assign@4.1.1
| +-- functional-red-black-tree@1.0.1
| +-- glob@7.1.2
| | +-- fs.realpath@1.0.0
| | +-- inflight@1.0.6
| | | +-- once@1.4.0 deduped
| | | `-- wrappy@1.0.2
| | +-- inherits@2.0.3 deduped
| | +-- minimatch@3.0.4 deduped
| | +-- once@1.4.0
| | | `-- wrappy@1.0.2 deduped
| | `-- path-is-absolute@1.0.1
| +-- globals@9.18.0
| +-- ignore@3.3.7
| +-- imurmurhash@0.1.4
| +-- inquirer@3.3.0
| | +-- ansi-escapes@3.0.0
| | +-- chalk@2.3.0 deduped
| | +-- cli-cursor@2.1.0
| | | `-- restore-cursor@2.0.0
| | |   +-- onetime@2.0.1
| | |   | `-- mimic-fn@1.1.0
| | |   `-- signal-exit@3.0.2
| | +-- cli-width@2.2.0
| | +-- external-editor@2.0.5
| | | +-- iconv-lite@0.4.19
| | | +-- jschardet@1.6.0
| | | `-- tmp@0.0.33
| | |   `-- os-tmpdir@1.0.2
| | +-- figures@2.0.0
| | | `-- escape-string-regexp@1.0.5 deduped
| | +-- lodash@4.17.4 deduped
| | +-- mute-stream@0.0.7
| | +-- run-async@2.3.0
| | | `-- is-promise@2.1.0
| | +-- rx-lite@4.0.8
| | +-- rx-lite-aggregates@4.0.8
| | | `-- rx-lite@4.0.8 deduped
| | +-- string-width@2.1.1
| | | +-- is-fullwidth-code-point@2.0.0
| | | `-- strip-ansi@4.0.0 deduped
| | +-- strip-ansi@4.0.0 deduped
| | `-- through@2.3.8
| +-- is-resolvable@1.0.0
| | `-- tryit@1.0.3
| +-- js-yaml@3.10.0
| | +-- argparse@1.0.9
| | | `-- sprintf-js@1.0.3
| | `-- esprima@4.0.0
| +-- json-stable-stringify-without-jsonify@1.0.1
| +-- levn@0.3.0
| | +-- prelude-ls@1.1.2
| | `-- type-check@0.3.2
| |   `-- prelude-ls@1.1.2 deduped
| +-- lodash@4.17.4
| +-- minimatch@3.0.4
| | `-- brace-expansion@1.1.8
| |   +-- balanced-match@1.0.0
| |   `-- concat-map@0.0.1
| +-- mkdirp@0.5.1
| | `-- minimist@0.0.8
| +-- natural-compare@1.4.0
| +-- optionator@0.8.2
| | +-- deep-is@0.1.3
| | +-- fast-levenshtein@2.0.6
| | +-- levn@0.3.0 deduped
| | +-- prelude-ls@1.1.2 deduped
| | +-- type-check@0.3.2 deduped
| | `-- wordwrap@1.0.0
| +-- path-is-inside@1.0.2
| +-- pluralize@7.0.0
| +-- progress@2.0.0
| +-- require-uncached@1.0.3
| | +-- caller-path@0.1.0
| | | `-- callsites@0.2.0
| | `-- resolve-from@1.0.1
| +-- semver@5.4.1
| +-- strip-ansi@4.0.0
| | `-- ansi-regex@3.0.0
| +-- strip-json-comments@2.0.1
| +-- table@4.0.2
| | +-- ajv@5.3.0 deduped
| | +-- ajv-keywords@2.1.1
| | +-- chalk@2.3.0 deduped
| | +-- lodash@4.17.4 deduped
| | +-- slice-ansi@1.0.0
| | | `-- is-fullwidth-code-point@2.0.0 deduped
| | `-- string-width@2.1.1 deduped
| `-- text-table@0.2.0
`-- vue-eslint-parser@2.0.1-beta.2
  +-- debug@3.1.0 deduped
  +-- eslint-scope@3.7.1 deduped
  +-- espree@3.5.2 deduped
  +-- esquery@1.0.0 deduped
  `-- lodash@4.17.4 deduped

[Robula]

Sure, here you go

Robs-MBP:vep-issue robfinbow$ npm ls
/Users/robfinbow/DEV/vep-issue
├─┬ babel-eslint@8.0.2
│ ├─┬ @babel/code-frame@7.0.0-beta.31
│ │ ├── chalk@2.3.0 deduped
│ │ ├── esutils@2.0.2 deduped
│ │ └── js-tokens@3.0.2
│ ├─┬ @babel/traverse@7.0.0-beta.31
│ │ ├── @babel/code-frame@7.0.0-beta.31 deduped
│ │ ├─┬ @babel/helper-function-name@7.0.0-beta.31
│ │ │ ├─┬ @babel/helper-get-function-arity@7.0.0-beta.31
│ │ │ │ └── @babel/types@7.0.0-beta.31 deduped
│ │ │ ├─┬ @babel/template@7.0.0-beta.31
│ │ │ │ ├── @babel/code-frame@7.0.0-beta.31 deduped
│ │ │ │ ├── @babel/types@7.0.0-beta.31 deduped
│ │ │ │ ├── babylon@7.0.0-beta.31 deduped
│ │ │ │ └── lodash@4.17.4 deduped
│ │ │ ├── @babel/traverse@7.0.0-beta.31 deduped
│ │ │ └── @babel/types@7.0.0-beta.31 deduped
│ │ ├── @babel/types@7.0.0-beta.31 deduped
│ │ ├── babylon@7.0.0-beta.31 deduped
│ │ ├── debug@3.1.0 deduped
│ │ ├── globals@10.3.0
│ │ ├─┬ invariant@2.2.2
│ │ │ └─┬ loose-envify@1.3.1
│ │ │   └── js-tokens@3.0.2 deduped
│ │ └── lodash@4.17.4 deduped
│ ├─┬ @babel/types@7.0.0-beta.31
│ │ ├── esutils@2.0.2 deduped
│ │ ├── lodash@4.17.4 deduped
│ │ └── to-fast-properties@2.0.0
│ └── babylon@7.0.0-beta.31
├─┬ eslint@4.10.0
│ ├─┬ ajv@5.3.0
│ │ ├── co@4.6.0
│ │ ├── fast-deep-equal@1.0.0
│ │ ├── fast-json-stable-stringify@2.0.0
│ │ └── json-schema-traverse@0.3.1
│ ├─┬ babel-code-frame@6.26.0
│ │ ├─┬ chalk@1.1.3
│ │ │ ├── ansi-styles@2.2.1
│ │ │ ├── escape-string-regexp@1.0.5 deduped
│ │ │ ├─┬ has-ansi@2.0.0
│ │ │ │ └── ansi-regex@2.1.1 deduped
│ │ │ ├─┬ strip-ansi@3.0.1
│ │ │ │ └── ansi-regex@2.1.1
│ │ │ └── supports-color@2.0.0
│ │ ├── esutils@2.0.2 deduped
│ │ └── js-tokens@3.0.2 deduped
│ ├─┬ chalk@2.3.0
│ │ ├─┬ ansi-styles@3.2.0
│ │ │ └─┬ color-convert@1.9.1
│ │ │   └── color-name@1.1.3
│ │ ├── escape-string-regexp@1.0.5
│ │ └─┬ supports-color@4.5.0
│ │   └── has-flag@2.0.0
│ ├─┬ concat-stream@1.6.0
│ │ ├── inherits@2.0.3
│ │ ├─┬ readable-stream@2.3.3
│ │ │ ├── core-util-is@1.0.2
│ │ │ ├── inherits@2.0.3 deduped
│ │ │ ├── isarray@1.0.0 deduped
│ │ │ ├── process-nextick-args@1.0.7
│ │ │ ├── safe-buffer@5.1.1
│ │ │ ├─┬ string_decoder@1.0.3
│ │ │ │ └── safe-buffer@5.1.1 deduped
│ │ │ └── util-deprecate@1.0.2
│ │ └── typedarray@0.0.6
│ ├─┬ cross-spawn@5.1.0
│ │ ├─┬ lru-cache@4.1.1
│ │ │ ├── pseudomap@1.0.2
│ │ │ └── yallist@2.1.2
│ │ ├─┬ shebang-command@1.2.0
│ │ │ └── shebang-regex@1.0.0
│ │ └─┬ which@1.3.0
│ │   └── isexe@2.0.0
│ ├─┬ debug@3.1.0
│ │ └── ms@2.0.0
│ ├─┬ doctrine@2.0.0
│ │ ├── esutils@2.0.2 deduped
│ │ └── isarray@1.0.0
│ ├─┬ eslint-scope@3.7.1
│ │ ├─┬ esrecurse@4.2.0
│ │ │ ├── estraverse@4.2.0 deduped
│ │ │ └── object-assign@4.1.1 deduped
│ │ └── estraverse@4.2.0 deduped
│ ├─┬ espree@3.5.1
│ │ ├── acorn@5.2.1
│ │ └─┬ acorn-jsx@3.0.1
│ │   └── acorn@3.3.0
│ ├─┬ esquery@1.0.0
│ │ └── estraverse@4.2.0 deduped
│ ├── estraverse@4.2.0
│ ├── esutils@2.0.2
│ ├─┬ file-entry-cache@2.0.0
│ │ ├─┬ flat-cache@1.3.0
│ │ │ ├── circular-json@0.3.3
│ │ │ ├─┬ del@2.2.2
│ │ │ │ ├─┬ globby@5.0.0
│ │ │ │ │ ├─┬ array-union@1.0.2
│ │ │ │ │ │ └── array-uniq@1.0.3
│ │ │ │ │ ├── arrify@1.0.1
│ │ │ │ │ ├── glob@7.1.2 deduped
│ │ │ │ │ ├── object-assign@4.1.1 deduped
│ │ │ │ │ ├── pify@2.3.0 deduped
│ │ │ │ │ └── pinkie-promise@2.0.1 deduped
│ │ │ │ ├── is-path-cwd@1.0.0
│ │ │ │ ├─┬ is-path-in-cwd@1.0.0
│ │ │ │ │ └─┬ is-path-inside@1.0.0
│ │ │ │ │   └── path-is-inside@1.0.2 deduped
│ │ │ │ ├── object-assign@4.1.1 deduped
│ │ │ │ ├── pify@2.3.0
│ │ │ │ ├─┬ pinkie-promise@2.0.1
│ │ │ │ │ └── pinkie@2.0.4
│ │ │ │ └─┬ rimraf@2.6.2
│ │ │ │   └── glob@7.1.2 deduped
│ │ │ ├── graceful-fs@4.1.11
│ │ │ └─┬ write@0.2.1
│ │ │   └── mkdirp@0.5.1 deduped
│ │ └── object-assign@4.1.1
│ ├── functional-red-black-tree@1.0.1
│ ├─┬ glob@7.1.2
│ │ ├── fs.realpath@1.0.0
│ │ ├─┬ inflight@1.0.6
│ │ │ ├── once@1.4.0 deduped
│ │ │ └── wrappy@1.0.2
│ │ ├── inherits@2.0.3 deduped
│ │ ├── minimatch@3.0.4 deduped
│ │ ├─┬ once@1.4.0
│ │ │ └── wrappy@1.0.2 deduped
│ │ └── path-is-absolute@1.0.1
│ ├── globals@9.18.0
│ ├── ignore@3.3.7
│ ├── imurmurhash@0.1.4
│ ├─┬ inquirer@3.3.0
│ │ ├── ansi-escapes@3.0.0
│ │ ├── chalk@2.3.0 deduped
│ │ ├─┬ cli-cursor@2.1.0
│ │ │ └─┬ restore-cursor@2.0.0
│ │ │   ├─┬ onetime@2.0.1
│ │ │   │ └── mimic-fn@1.1.0
│ │ │   └── signal-exit@3.0.2
│ │ ├── cli-width@2.2.0
│ │ ├─┬ external-editor@2.0.5
│ │ │ ├── iconv-lite@0.4.19
│ │ │ ├── jschardet@1.6.0
│ │ │ └─┬ tmp@0.0.33
│ │ │   └── os-tmpdir@1.0.2
│ │ ├─┬ figures@2.0.0
│ │ │ └── escape-string-regexp@1.0.5 deduped
│ │ ├── lodash@4.17.4 deduped
│ │ ├── mute-stream@0.0.7
│ │ ├─┬ run-async@2.3.0
│ │ │ └── is-promise@2.1.0
│ │ ├── rx-lite@4.0.8
│ │ ├─┬ rx-lite-aggregates@4.0.8
│ │ │ └── rx-lite@4.0.8 deduped
│ │ ├─┬ string-width@2.1.1
│ │ │ ├── is-fullwidth-code-point@2.0.0
│ │ │ └── strip-ansi@4.0.0 deduped
│ │ ├── strip-ansi@4.0.0 deduped
│ │ └── through@2.3.8
│ ├─┬ is-resolvable@1.0.0
│ │ └── tryit@1.0.3
│ ├─┬ js-yaml@3.10.0
│ │ ├─┬ argparse@1.0.9
│ │ │ └── sprintf-js@1.0.3
│ │ └── esprima@4.0.0
│ ├─┬ json-stable-stringify@1.0.1
│ │ └── jsonify@0.0.0
│ ├─┬ levn@0.3.0
│ │ ├── prelude-ls@1.1.2
│ │ └─┬ type-check@0.3.2
│ │   └── prelude-ls@1.1.2 deduped
│ ├── lodash@4.17.4
│ ├─┬ minimatch@3.0.4
│ │ └─┬ brace-expansion@1.1.8
│ │   ├── balanced-match@1.0.0
│ │   └── concat-map@0.0.1
│ ├─┬ mkdirp@0.5.1
│ │ └── minimist@0.0.8
│ ├── natural-compare@1.4.0
│ ├─┬ optionator@0.8.2
│ │ ├── deep-is@0.1.3
│ │ ├── fast-levenshtein@2.0.6
│ │ ├── levn@0.3.0 deduped
│ │ ├── prelude-ls@1.1.2 deduped
│ │ ├── type-check@0.3.2 deduped
│ │ └── wordwrap@1.0.0
│ ├── path-is-inside@1.0.2
│ ├── pluralize@7.0.0
│ ├── progress@2.0.0
│ ├─┬ require-uncached@1.0.3
│ │ ├─┬ caller-path@0.1.0
│ │ │ └── callsites@0.2.0
│ │ └── resolve-from@1.0.1
│ ├── semver@5.4.1
│ ├─┬ strip-ansi@4.0.0
│ │ └── ansi-regex@3.0.0
│ ├── strip-json-comments@2.0.1
│ ├─┬ table@4.0.2
│ │ ├── ajv@5.3.0 deduped
│ │ ├── ajv-keywords@2.1.1
│ │ ├── chalk@2.3.0 deduped
│ │ ├── lodash@4.17.4 deduped
│ │ ├─┬ slice-ansi@1.0.0
│ │ │ └── is-fullwidth-code-point@2.0.0 deduped
│ │ └── string-width@2.1.1 deduped
│ └── text-table@0.2.0
├── vue@2.5.3
├── vue-class-component@6.1.0
└─┬ vue-eslint-parser@2.0.1-beta.2
  ├── debug@3.1.0 deduped
  ├── eslint-scope@3.7.1 deduped
  ├── espree@3.5.1 deduped
  ├── esquery@1.0.0 deduped
  └── lodash@4.17.4 deduped

I can't see much difference except that you have eslint-plugin-react (what treachery! 😄)

[mysticatea]

Thank you.

But sorry, I didn't find meaningful different.... (I checked estraverse, babel-eslint, eslint-scope. The babel-eslint is finding eslint-scope and estraverse in order to monkey-patching. If there is different dedupe situation, I guessed it's the cause. But no...)

I realized your screenshot has yarn.lock, so I tried to use yarn, but I got the same result (no errors)...

[mysticatea]

Maybe I got it.

[cmizzi]

I've got the same bug here (my configuration seems to be the same as @Robula)

[mysticatea]

Yes. This happens when a code is using stage 0-3 syntaxes or type annotations. I'm working on this, but I need more time.

The cause is that vue-eslint-parser does not get the monkey patching of babel-eslint. The monkey patching affects to ESLint core, but does not to this parser. I'm working to remove the monkey patching on the new feature of ESLint core.

[Robula]

Thank you for the explanation and your efforts to resolve this @mysticatea.

[mysticatea]

Thank you for your patience.

I'm still working in progress, but I have gotten that eslint/eslint#8755 is accepted at the last ESLint TSC Meeting and can advance babel/babel-eslint#542 to remove the monkey patching.

[mysticatea]

eslint@4.14.0 has been released. It includes the enhancement and I removed the monkeypatch from babel-eslint. I'll advance to fix this issue.