Intl.LocaleMatcher ponyfill providing comprehensive locale matching algorithms with support for 'lookup' and 'best fit' strategies
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{
"context": "This criteria evaluates the engineer's understanding and correct usage of @formatjs/intl-localematcher's two distinct locale matching algorithms: 'lookup' (strict hierarchical) and 'best fit' (linguistically-aware). The focus is on whether they correctly select and configure the appropriate algorithm based on the matching requirements.",
"type": "weighted_checklist",
"checklist": [
{
"name": "Import match function",
"description": "Correctly imports the `match` function from '@formatjs/intl-localematcher' package",
"max_score": 10
},
{
"name": "Lookup algorithm usage",
"description": "Uses `match()` function with `algorithm: 'lookup'` option parameter to implement strict hierarchical matching that does not match across locale variants",
"max_score": 25
},
{
"name": "Best fit algorithm usage",
"description": "Uses `match()` function with `algorithm: 'best fit'` option parameter (or omits algorithm option to use default) to implement flexible linguistically-aware matching that can match across related locale variants",
"max_score": 25
},
{
"name": "Algorithm selection logic",
"description": "Correctly selects between 'lookup' and 'best fit' algorithms based on the `requireExactFallback` parameter: 'lookup' when true (strict), 'best fit' when false (flexible)",
"max_score": 20
},
{
"name": "Function signature correctness",
"description": "Passes correct arguments to `match()` in proper order: requestedLocales array, availableLocales array, defaultLocale string, and options object with algorithm property",
"max_score": 15
},
{
"name": "Return value handling",
"description": "Returns the string result from `match()` function directly as the resolved locale",
"max_score": 5
}
]
}Install with Tessl CLI
npx tessl i tessl/npm-formatjs--intl-localematcherdocs
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