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TypeError: Cannot read property '_walk' of null #928

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ariovistus opened this issue Oct 9, 2018 · 14 comments · Fixed by #941
Closed

TypeError: Cannot read property '_walk' of null #928

ariovistus opened this issue Oct 9, 2018 · 14 comments · Fixed by #941

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@ariovistus
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I'm submitting a bug report

  • Library Version:
    0.32.0

Please tell us about your environment:

  • Operating System:
    Linux (fedora)

  • Node Version:
    8.12.0

  • NPM Version:
    6.4.1

  • Browser:
    all

  • Language:
    all

  • Loader/bundler:
    RequireJS

Current behavior:
I managed to build something that uglifyjs pukes on:
https://travis-ci.org/frc3223/stats/builds/438988302

turning off minification is a workaround, but I'd kind of like to not have to do that
code is here: https://github.com/frc3223/stats/tree/uglibug

  • What is the expected behavior?
    app can be built with minification enabled

  • What is the motivation / use case for changing the behavior?
@3cp
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3cp commented Oct 9, 2018

Your version is too old.
v0.34.0 has replaced uglify with terser for modern JS syntax compatibility.

If you upgrade to today's release v1.0.0-beta.1, make sure you follow the migration guide https://aurelia.io/blog/2018/10/08/release-aurelia-cli-with-auto-tracing-bundler

@vermilion
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vermilion commented Oct 9, 2018 •
edited
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@huochunpeng, faced same issue while building with prod-minify config @v1.0.0-beta.1
Everything worked fine using v0.35

ERROR [Bundle] Failed to write the bundle
INFO [Bundle] TypeError: Cannot read property '_walk' of null
...[path]\node_modules\async-done\index.js:18
    throw err;
    ^

My config in aurelia.json

    "options": {
      "minify": {
        "prod": {
          "mangle": {
            "keep_fnames": true,
            "toplevel": true
          }
        },
        "stage": {}
      },
      "sourcemaps": "dev & stage"
    },

@3cp
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3cp commented Oct 9, 2018

@vermilion are you using async-done, is it the one causing trouble? I could not get async-done working in browser, my app fails.
But the bundling is ok, even with minify in prod plus your minify config.

@vermilion
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This is my new auto-tracing log. I don't use it explicitly, maybe some of deps are using it... How could I find such?

INFO [Bundle] Manually adding package: 2.3.0      aurelia-bootstrapper
INFO [Bundle] Manually adding package: 1.0.4      aurelia-loader-default
INFO [Bundle] Manually adding package: 1.8.0      aurelia-pal-browser
INFO [Bundle] Manually adding package: 2.0.15     text
INFO [Bundler] Tracing files ...
INFO [Bundler] Auto tracing package: 1.1.4      au-bootstrap
INFO [Bundler] Auto tracing package: 1.0.0      au-configuration
INFO [Bundler] Auto tracing package: 1.3.3      au-container
INFO [Bundler] Auto tracing package: 1.1.8      au-core
INFO [Bundler] Auto tracing package: 1.0.1      au-dropdown
INFO [Bundler] Auto tracing package: 1.0.2      au-files
INFO [Bundler] Auto tracing package: 2.1.3      au-grid
INFO [Bundler] Auto tracing package: 1.0.0      au-loader
INFO [Bundler] Auto tracing package: 1.0.2      au-modals
INFO [Bundler] Auto tracing package: 1.0.0      au-notify
INFO [Bundler] Auto tracing package: 1.4.1      au-request-builder
INFO [Bundler] Auto tracing package: 2.0.5      au-select
INFO [Bundler] Auto tracing package: 2.2.3      au-sidebar-control
INFO [Bundler] Auto tracing package: 1.0.3      au-websocket
INFO [Bundler] Auto tracing package: 1.4.1      aurelia-dependency-injection
INFO [Bundler] Auto tracing package: 1.0.0      aurelia-dialog
INFO [Bundler] Auto tracing package: 1.0.1      aurelia-event-aggregator
INFO [Bundler] Auto tracing package: 1.3.0      aurelia-framework
INFO [Bundler] Auto tracing package: 1.2.0      aurelia-history-browser
INFO [Bundler] Auto tracing package: 1.0.0      aurelia-loader
INFO [Bundler] Auto tracing package: 1.0.0      aurelia-logging-console
INFO [Bundler] Auto tracing package: 1.0.4      aurelia-metadata
INFO [Bundler] Auto tracing package: 1.8.0      aurelia-pal
INFO [Bundler] Auto tracing package: 1.3.0      aurelia-polyfills
INFO [Bundler] Auto tracing package: 1.6.3      aurelia-router
INFO [Bundler] Auto tracing package: 1.4.3      aurelia-templating-binding
INFO [Bundler] Auto tracing package: 1.7.1      aurelia-templating-resources
INFO [Bundler] Auto tracing package: 1.3.3      aurelia-templating-router
INFO [Bundler] Auto tracing package: 1.0.0-beta.3.3.2 aurelia-ui-virtualization
INFO [Bundler] Auto tracing package: 1.2.3      aurelia-validation
INFO [Bundler] Auto tracing package: 2.1.5      aurelia-binding
INFO [Bundler] Auto tracing package: 1.1.0      aurelia-history
INFO [Bundler] Auto tracing package: 1.3.0      aurelia-http-client
INFO [Bundler] Auto tracing package: 1.5.0      aurelia-logging
INFO [Bundler] Auto tracing package: 1.1.1      aurelia-path
INFO [Bundler] Auto tracing package: 1.2.0      aurelia-route-recognizer
INFO [Bundler] Auto tracing package: 1.3.1      aurelia-task-queue
INFO [Bundler] Auto tracing package: 1.10.0     aurelia-templating
INFO [Bundler] Auto tracing package: 2.22.2     moment
INFO [Bundler] Auto tracing package: 1.4.5      tether
INFO [Bundler] Auto tracing package: 1.5.2      velocity-animate
INFO [Bundle] Writing app-bundle.js...
INFO [Bundle] Writing vendor-bundle.js...
Application Available At: http://localhost:9000
BrowserSync Available At: http://localhost:3001

@3cp
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3cp commented Oct 9, 2018

Looks like this is related terser/terser#120

@3cp
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3cp commented Oct 9, 2018

@vermillion nvm, async-done is deep dep of cli itself, not your frontend.

@3cp
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3cp commented Oct 9, 2018

@vermillion can you share your full error log? Must be some package triggered that terser bug.

@vermilion
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Here it is - prod log

running command> au run --watch --env prod
INFO [Bundle] Manually adding package: 2.3.0      aurelia-bootstrapper
INFO [Bundle] Manually adding package: 1.0.4      aurelia-loader-default
INFO [Bundle] Manually adding package: 1.8.0      aurelia-pal-browser
INFO [Bundle] Manually adding package: 2.0.15     text
INFO [Bundler] Tracing files ...
INFO [Bundler] Auto tracing package: 1.1.4      au-bootstrap
INFO [Bundler] Auto tracing package: 1.0.0      au-configuration
INFO [Bundler] Auto tracing package: 1.3.3      au-container
INFO [Bundler] Auto tracing package: 1.1.8      au-core
INFO [Bundler] Auto tracing package: 1.0.1      au-dropdown
INFO [Bundler] Auto tracing package: 1.0.2      au-files
INFO [Bundler] Auto tracing package: 2.1.3      au-grid
INFO [Bundler] Auto tracing package: 1.0.0      au-loader
INFO [Bundler] Auto tracing package: 1.0.2      au-modals
INFO [Bundler] Auto tracing package: 1.0.0      au-notify
INFO [Bundler] Auto tracing package: 1.4.1      au-request-builder
INFO [Bundler] Auto tracing package: 2.0.5      au-select
INFO [Bundler] Auto tracing package: 2.2.3      au-sidebar-control
INFO [Bundler] Auto tracing package: 1.0.3      au-websocket
INFO [Bundler] Auto tracing package: 1.4.1      aurelia-dependency-injection
INFO [Bundler] Auto tracing package: 1.0.0      aurelia-dialog
INFO [Bundler] Auto tracing package: 1.0.1      aurelia-event-aggregator
INFO [Bundler] Auto tracing package: 1.3.0      aurelia-framework
INFO [Bundler] Auto tracing package: 1.2.0      aurelia-history-browser
INFO [Bundler] Auto tracing package: 1.0.0      aurelia-loader
INFO [Bundler] Auto tracing package: 1.0.0      aurelia-logging-console
INFO [Bundler] Auto tracing package: 1.0.4      aurelia-metadata
INFO [Bundler] Auto tracing package: 1.8.0      aurelia-pal
INFO [Bundler] Auto tracing package: 1.3.0      aurelia-polyfills
INFO [Bundler] Auto tracing package: 1.6.3      aurelia-router
INFO [Bundler] Auto tracing package: 1.4.3      aurelia-templating-binding
INFO [Bundler] Auto tracing package: 1.7.1      aurelia-templating-resources
INFO [Bundler] Auto tracing package: 1.3.3      aurelia-templating-router
INFO [Bundler] Auto tracing package: 1.0.0-beta.3.3.2 aurelia-ui-virtualization
INFO [Bundler] Auto tracing package: 1.2.3      aurelia-validation
INFO [Bundler] Auto tracing package: 2.1.5      aurelia-binding
INFO [Bundler] Auto tracing package: 1.1.0      aurelia-history
INFO [Bundler] Auto tracing package: 1.3.0      aurelia-http-client
INFO [Bundler] Auto tracing package: 1.5.0      aurelia-logging
INFO [Bundler] Auto tracing package: 1.1.1      aurelia-path
INFO [Bundler] Auto tracing package: 1.2.0      aurelia-route-recognizer
INFO [Bundler] Auto tracing package: 1.3.1      aurelia-task-queue
INFO [Bundler] Auto tracing package: 1.10.0     aurelia-templating
INFO [Bundler] Auto tracing package: 2.22.2     moment
INFO [Bundler] Auto tracing package: 1.4.5      tether
INFO [Bundler] Auto tracing package: 1.5.2      velocity-animate
INFO [Bundle] Writing app-bundle.js...
INFO [Bundle] Writing vendor-bundle.js...
ERROR [Bundle] Failed to write the bundle
INFO [Bundle] TypeError: Cannot read property '_walk' of null
C:\work\Xerox.Infolio\Xerox.Infolio-rebase\Infolio\Infolio.Core.Service\InfolioWebAdmin\node_modules\async-done\index.js:18
    throw err;
    ^

Error: Unhandled "error" event. ([object Object])
    at Gulp.emit (events.js:186:19)
    at Object.error (C:\work\Xerox.Infolio\Xerox.Infolio-rebase\Infolio\Infolio.Core.Service\InfolioWebAdmin\node_modules\undertaker\lib\helpers\createExtensions.js:61:10)
    at handler (C:\work\Xerox.Infolio\Xerox.Infolio-rebase\Infolio\Infolio.Core.Service\InfolioWebAdmin\node_modules\now-and-later\lib\mapSeries.js:43:14)
    at f (C:\work\Xerox.Infolio\Xerox.Infolio-rebase\Infolio\Infolio.Core.Service\InfolioWebAdmin\node_modules\once\once.js:25:25)
    at f (C:\work\Xerox.Infolio\Xerox.Infolio-rebase\Infolio\Infolio.Core.Service\InfolioWebAdmin\node_modules\once\once.js:25:25)
    at tryCatch (C:\work\Xerox.Infolio\Xerox.Infolio-rebase\Infolio\Infolio.Core.Service\InfolioWebAdmin\node_modules\async-done\index.js:24:15)
    at done (C:\work\Xerox.Infolio\Xerox.Infolio-rebase\Infolio\Infolio.Core.Service\InfolioWebAdmin\node_modules\async-done\index.js:40:12)
    at onError (C:\work\Xerox.Infolio\Xerox.Infolio-rebase\Infolio\Infolio.Core.Service\InfolioWebAdmin\node_modules\async-done\index.js:51:5)
    at <anonymous>

Watching build tasks has finished.

@3cp
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3cp commented Oct 9, 2018

@vermilion can you try this temporary fix suggested in that terser issue?

"options": {
      "minify": {
        "prod": {
          "mangle": {
            "keep_fnames": true,
            "toplevel": true
          },
          "compress": {
           "collapse_vars": false
          }
        },
        "stage": {}
      },

@3cp
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3cp commented Oct 9, 2018

Seems like an issue affected the whole uglify family :-)
shipshapecode/tether#291

@vermilion
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@huochunpeng, your workaround works fine! Now waiting for an official bugfix :)

@3cp
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3cp commented Oct 9, 2018

@ariovistus I guess you only need the compress config patch.

"options": {
      "minify": {
        "prod": {
          "compress": {
           "collapse_vars": false
          }
        },
        "stage": {
          "compress": {
           "collapse_vars": false
          }
        }
      },

@Alexander-Taran
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It is "moment"
it does not like to be minified.

@3cp
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3cp commented Oct 14, 2018

It seems like a nasty bug that uglify/terser guys have yet to fix. This is a combination of compress options, turn off any one of them could bypass the issue.

I think we can ship cli with a default compress options patch. I will do a PR.

@3cp 3cp mentioned this issue Oct 14, 2018
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fix(bundler): bypass a nasty terser compress bug by using fast-minify-mode
4 participants
@ariovistus @Alexander-Taran @3cp @vermilion