Owner

terser

3 indexed repositories · View on GitHub

terser
🗜 JavaScript parser, mangler and compressor toolkit for ES6+

JavaScript · 9341 stars
html-minifier-terser
actively maintained fork of html-minifier - minify HTML, CSS and JS code using terser - supports ES6 code

JavaScript · 481 stars
terser.github.io
🌐 Terser's website (automatically generated! for source see the repo: website)

HTML · 0 stars

Beginner friendly Everything

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Missing parentheses around `yield*` used as a tagged-template tag changes runtime behavior Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

terser/terser#1740 · Opened Sep 16, 2026
Inconsistent behavior when filtering out redundant inner-block variable assignment Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

terser/terser#1739 · Opened Sep 15, 2026
compress: unreachable switch case removal drops a CaseBlock function initializer Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

terser/terser#1729 · Opened Sep 1, 2026
keep_fnames on both compress and mangle writes class initializer to an undeclared global (module mode) Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

terser/terser#1727 · Opened Aug 31, 2026
Broken 5.51.0 and 5.51.1 Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

terser/terser#1725 · 1 comment · Opened Aug 27, 2026
5.51.0 regression: a called function is replaced with an empty arrow Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

terser/terser#1724 · 2 comments · Opened Aug 26, 2026
[BUG] Functions are inlined incorrectly if variable name matches a catch-block exception name Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

terser/terser#1712 · Opened Jul 23, 2026
join_vars folds an assignment into an object literal with a computed accessor key, skipping the setter Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

terser/terser#1709 · Opened Jul 18, 2026
fix: _default_options never awaits async infer_options calls, always returns empty object Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

terser/terser#1701 · Opened Jun 27, 2026
Mangle renames default parameter value to match destructured variable of same name, causing TDZ ReferenceError Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

terser/terser#1698 · 1 reaction · Opened Jun 22, 2026
Moving variable declaration to parameter list Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

terser/terser#1696 · Opened Jun 20, 2026
preserve_annotations preserves comments that merely mention an annotation token, not just real annotations Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

terser/terser#1690 · Opened Jun 3, 2026
fix: async infer_options called without await in _default_options Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

terser/terser#1669 · Opened Apr 2, 2026
fix: swallowed errors in infer_options hide real failures Open

Breaking Change

Difficulty 3/5 1-2 days Newbie friendliness 55/100

terser/terser#1667 · 3 comments · Opened Apr 2, 2026
Simplify simple arrow function Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

terser/terser#1665 · 2 comments · Opened Mar 24, 2026
"-" character in name appears to break --source-map "content=" modifier CLI Open

Difficulty 3/5 1-2 days Newbie friendliness 40/100

terser/terser#1664 · 1 comment · Opened Mar 16, 2026
Normalize equivalent HTML entities Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

terser/html-minifier-terser#211 · Opened Jan 20, 2026
How to make terser preserve \n when printing? Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/terser#1655 · Opened Jan 15, 2026
Property mangling can generate method names that collide with existing (including non-mangled) instance properties on the same prototype chain Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

terser/terser#1653 · Opened Dec 18, 2025
[BUG] Bad output for Self-Defining Functions Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

terser/terser#1649 · Opened Nov 28, 2025
Request of a watch mode feature Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

terser/html-minifier-terser#209 · Opened Nov 25, 2025
Improve docs on MANGLE_PROP Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/terser#1645 · Opened Nov 10, 2025
Mangle anything not reachable on public API surface Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

terser/terser#1642 · 5 comments · Opened Oct 13, 2025
Multi-line @license/copyright comments using single line comments not preserved, potential legal issues Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/terser#1641 · Opened Oct 7, 2025
bug with dead code remorer Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

terser/terser#1640 · 1 comment · Opened Sep 25, 2025
Reassigned string variable is duplicated in the final output when concatenated. Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

terser/terser#1639 · 1 comment · Opened Sep 12, 2025
element.dataset.key mangle with invalid characters ($) Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

terser/terser#1636 · Opened Aug 23, 2025
Memory leak caused by `compress: { reduce_funcs: true }` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

terser/terser#1633 · 1 comment · Opened Jul 31, 2025
[Bug] pure_getters: false still removes optional property access Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/terser#1632 · 5 comments · Opened Jul 21, 2025
Dropped/unused files should not be included in the sourcemap instead of setting them to null Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

terser/terser#1631 · Opened Jul 16, 2025
[Bug] `keep_numbers` cannot work? Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/terser#1627 · 1 comment · Opened Jul 9, 2025
[Feature Request] Table with supported / unsupported ES versions / features Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/terser#1626 · Opened Jun 26, 2025
[Bug] terser removes unused default parameters with side-effects Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/terser#1623 · Opened Jun 24, 2025
Duplicated identifier used when mangle is enabled Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

terser/terser#1618 · 2 comments · Opened Jun 13, 2025
[Feature Request] Table of Contents in README.md Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

terser/terser#1615 · 1 comment · Opened Jun 7, 2025
Synchronous minification Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/html-minifier-terser#195 · 2 comments · 5 reactions · Opened May 4, 2025
JSONSchema for configuration files Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/terser#1612 · Opened Apr 24, 2025
[Bug]: <tfoot> tag brokes the structure Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

terser/html-minifier-terser#194 · Opened Apr 13, 2025
ReferenceError: Cannot access 'Q' before initialization Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

terser/terser#1608 · Opened Apr 3, 2025
[Bug] Combination of safe options result in memory leaking code. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

terser/terser#1603 · Opened Mar 11, 2025
[Bug]: html-minifier-terser stuck on empty file Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/html-minifier-terser#193 · 2 reactions · Opened Mar 4, 2025
[Bug]: Does not preserve white space around custom web components Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

terser/html-minifier-terser#192 · Opened Mar 3, 2025
[Bug] Constant removed during minification, but reference to it remains causing error Open

bug compress

Difficulty 4/5 3-5 days Newbie friendliness 35/100

terser/terser#1596 · 1 comment · 2 reactions · Opened Feb 26, 2025
Parse error at undefined:undefined,undefined with multiple input sourcemap or invalid map Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

terser/terser#1595 · 1 comment · Opened Feb 24, 2025
[Bug] `"prop" in obj` syntax incorrectly mangled with keep_quoted=strict Open

Breaking Change

Difficulty 3/5 1-2 days Newbie friendliness 45/100

terser/terser#1594 · 4 comments · Opened Feb 24, 2025
[Bug] terser incorrectly removes ReferenceError for computed property using class name Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

terser/terser#1593 · Opened Feb 21, 2025
[Bug] terser removes non-iterable destructuring Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

terser/terser#1592 · Opened Feb 21, 2025
Cannot minify replaceAll() on non-constant-expression template strings with unsafe=true Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

terser/terser#1584 · Opened Jan 19, 2025
--mangle-props undeclared should error on non-property global references Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

terser/terser#1582 · Opened Jan 16, 2025
Mangle option debug inconsistent with private properties Open

Difficulty 3/5 1-2 days Newbie friendliness 46/100

terser/terser#1581 · Opened Jan 16, 2025

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