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Error on overwriting file with minified content

See original GitHub issue

I’d like to use this tool in my CD pipeline to overwrite a simple HTML file I have for a site. However, using the same input & output throws an error and does not succeed.

➜  start_page git:(master) ✗ npx minify static/index.html > static/index.html
npx: installed 25 in 2.483s
AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:


    at AsyncFunction.module.exports [as html] (/home/x/.npm/_npx/48208/lib/node_modules/minify/lib/html.js:38:5)
    at onDataRead (/home/x/.npm/_npx/48208/lib/node_modules/minify/lib/minify.js:75:44)
    at optimize (/home/x/.npm/_npx/48208/lib/node_modules/minify/lib/minify.js:61:18)
    at async minify (/home/x/.npm/_npx/48208/lib/node_modules/minify/lib/minify.js:35:12)
    at async Promise.all (index 0) {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: '',
  expected: true,
  operator: '=='

As this is the very last step in a deploy I really have no need to keep the original, unminified version around, so overwriting is ideal. As of now I have to write, remove the original, and then rename the minified version, which is a bit of an annoyance.

I’ll take a look myself, see if I can’t get something together to resolve this.

Issue Analytics

  • State:open
  • Created 3 years ago
  • Reactions:2
  • Comments:6 (4 by maintainers)

github_iconTop GitHub Comments

code-forgercommented, Jul 16, 2021

This is actually an issue in Bash. using $ minify hello.js > hello.js Bash will first execute the file redirect, prepare hello.js for writing by wiping it. Then it will execute the left hand side, allowing minify to read the now empty hello.js

Short of adding a flag called something like --overwrite-source that minifies, then writes the files back over themselves this project cannot support this.

@coderaiser What are your thoughts? would you be interested in a PR to that effect?

coderaisercommented, Jul 16, 2021

@code-forger yes, that’s amazing idea for a PR 😃.

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