error-ex

Easy error subclassing and stack customization
v1.3.2 URL: https://unpkg.com/error-ex@1.3.2/index.js
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errorerrorsextendextendingextensionsubclassstackcustom

make-error

Make your own error types!
v1.3.6 URL: https://unpkg.com/make-error@1.3.6/index.js
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createcustomderiveerrorerrorsextendextendingextensionfactoryinheritmakesubclass

json-custom-numbers

JSON parser and stringifier for custom numbers (e.g. BigInt)
v3.1.1 URL: https://unpkg.com/json-custom-numbers@3.1.1/index.js
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jsonparsestringifynumbersbigintcustomlosslessperformanceconformancecrockford

verror

richer JavaScript errors
v1.10.1 URL: https://unpkg.com/verror@1.10.1/lib/verror.js
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errorerrorserrexceptionexceptionscustom

postcss-custom-selectors

Use Custom Selectors in CSS
v8.0.5 URL: https://unpkg.com/postcss-custom-selectors@8.0.5/dist/index.cjs
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at-ruleatrulecsscsswgcustomdeclarativeextensionspostcsspostcss-pluginruleselectorsspecificationw3c