PostCSS plugin This project tries to fix all of flexbug's issues.

bug 4

.foo { flex: 1; }
.bar { flex: 1 1; }
.foz { flex: 1 1 0; }
.baz { flex: 1 1 0px; }

.foo { flex: 1 1; }
.bar { flex: 1 1; }
.foz { flex: 1 1; }
.baz { flex: 1 1; }

bug 6

.foo { flex: 1; }

.foo { flex: 1 1 0%; }

This only fixes css classes that have the flex property set. To fix elements that are contained inside a flexbox container, use this global rule:

* {
    flex-shrink: 1;
}

.foo { flex: 1 0 calc(1vw - 1px); }

.foo {
  flex-grow: 1;
  flex-shrink: 0;
  flex-basis: calc(1vw - 1px);
}

postcss([require('postcss-flexbugs-fixes')]);

You can also disable bugs individually, possible keys bug4, bug6 and bug8a.

var plugin = require('postcss-flexbugs-fixes');
postcss([plugin({ bug6: false })]);

See PostCSS docs for examples for your environment.