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| 1 | +declare namespace Intl { |
| 2 | + |
| 3 | + /** |
| 4 | + * [BCP 47 language tag](http://tools.ietf.org/html/rfc5646) definition. |
| 5 | + * |
| 6 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl#locales_argument). |
| 7 | + * |
| 8 | + * [Wikipedia](https://en.wikipedia.org/wiki/IETF_language_tag). |
| 9 | + */ |
| 10 | + type BCP47LanguageTag = string; |
| 11 | + |
| 12 | + /** |
| 13 | + * Unit to use in the relative time internationalized message. |
| 14 | + * |
| 15 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/format#Parameters). |
| 16 | + * |
| 17 | + * [Specification](https://tc39.es/ecma402/#sec-singularrelativetimeunit). |
| 18 | + */ |
| 19 | + type RelativeTimeFormatUnit = |
| 20 | + | "year" | "years" |
| 21 | + | "quarter" | "quarters" |
| 22 | + | "month" | "months" |
| 23 | + | "week" | "weeks" |
| 24 | + | "day" | "days" |
| 25 | + | "hour" | "hours" |
| 26 | + | "minute" | "minutes" |
| 27 | + | "second" | "seconds" |
| 28 | + ; |
| 29 | + |
| 30 | + /** |
| 31 | + * The locale matching algorithm to use. |
| 32 | + * |
| 33 | + * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl#Locale_negotiation). |
| 34 | + * |
| 35 | + * [Specification](https://tc39.es/ecma402/#sec-InitializeRelativeTimeFormat). |
| 36 | + */ |
| 37 | + type RelativeTimeFormatLocaleMatcher = "lookup" | "best fit"; |
| 38 | + |
| 39 | + /** |
| 40 | + * The format of output message. |
| 41 | + * |
| 42 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/RelativeTimeFormat#Parameters). |
| 43 | + * |
| 44 | + * [Specification](https://tc39.es/ecma402/#sec-InitializeRelativeTimeFormat). |
| 45 | + */ |
| 46 | + type RelativeTimeFormatNumeric = "always" | "auto"; |
| 47 | + |
| 48 | + /** |
| 49 | + * The length of the internationalized message. |
| 50 | + * |
| 51 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/RelativeTimeFormat#Parameters). |
| 52 | + * |
| 53 | + * [Specification](https://tc39.es/ecma402/#sec-InitializeRelativeTimeFormat). |
| 54 | + */ |
| 55 | + type RelativeTimeFormatStyle = "long" | "short" | "narrow"; |
| 56 | + |
| 57 | + /** |
| 58 | + * An object with some or all of properties of `options` parameter |
| 59 | + * of `Intl.RelativeTimeFormat` constructor. |
| 60 | + * |
| 61 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/RelativeTimeFormat#Parameters). |
| 62 | + * |
| 63 | + * [Specification](https://tc39.es/ecma402/#sec-InitializeRelativeTimeFormat). |
| 64 | + */ |
| 65 | + interface RelativeTimeFormatOptions { |
| 66 | + localeMatcher?: RelativeTimeFormatLocaleMatcher; |
| 67 | + numeric?: RelativeTimeFormatNumeric; |
| 68 | + style?: RelativeTimeFormatStyle; |
| 69 | + } |
| 70 | + |
| 71 | + /** |
| 72 | + * An object with properties reflecting the locale |
| 73 | + * and formatting options computed during initialization |
| 74 | + * of the `Intel.RelativeTimeFormat` object |
| 75 | + * |
| 76 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/resolvedOptions#Description). |
| 77 | + * |
| 78 | + * [Specification](https://tc39.es/ecma402/#table-relativetimeformat-resolvedoptions-properties) |
| 79 | + */ |
| 80 | + interface ResolvedRelativeTimeFormatOptions { |
| 81 | + locale: BCP47LanguageTag; |
| 82 | + style: RelativeTimeFormatStyle; |
| 83 | + numeric: RelativeTimeFormatNumeric; |
| 84 | + numberingSystem: string; |
| 85 | + } |
| 86 | + |
| 87 | + /** |
| 88 | + * An object representing the relative time format in parts |
| 89 | + * that can be used for custom locale-aware formatting. |
| 90 | + * |
| 91 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/formatToParts#Using_formatToParts). |
| 92 | + * |
| 93 | + * [Specification](https://tc39.es/ecma402/#sec-FormatRelativeTimeToParts). |
| 94 | + */ |
| 95 | + interface RelativeTimeFormatPart { |
| 96 | + type: string; |
| 97 | + value: string; |
| 98 | + unit?: RelativeTimeFormatUnit; |
| 99 | + } |
| 100 | + |
| 101 | + interface RelativeTimeFormat { |
| 102 | + /** |
| 103 | + * Formats a value and a unit according to the locale |
| 104 | + * and formatting options of the given |
| 105 | + * [`Intl.RelativeTimeFormat`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat) |
| 106 | + * object. |
| 107 | + * |
| 108 | + * While this method automatically provides the correct plural forms, |
| 109 | + * the grammatical form is otherwise as neutral as possible. |
| 110 | + * It is the caller's responsibility to handle cut-off logic |
| 111 | + * such as deciding between displaying "in 7 days" or "in 1 week". |
| 112 | + * This API does not support relative dates involving compound units. |
| 113 | + * e.g "in 5 days and 4 hours". |
| 114 | + * |
| 115 | + * @param value - Numeric value to use in the internationalized relative time message |
| 116 | + * |
| 117 | + * @param unit - [Unit](https://tc39.es/ecma402/#sec-singularrelativetimeunit) |
| 118 | + * to use in the relative time internationalized message. |
| 119 | + * Possible values are: `"year"`, `"quarter"`, `"month"`, `"week"`, |
| 120 | + * `"day"`, `"hour"`, `"minute"`, `"second"`. |
| 121 | + * Plural forms are also permitted. |
| 122 | + * |
| 123 | + * @throws `RangeError` if `unit` was given something other than `unit` possible values |
| 124 | + * |
| 125 | + * @returns Internationalized relative time message as string |
| 126 | + * |
| 127 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/format). |
| 128 | + * |
| 129 | + * [Specification](https://tc39.es/ecma402/#sec-Intl.RelativeTimeFormat.prototype.format). |
| 130 | + */ |
| 131 | + format( |
| 132 | + value: number, |
| 133 | + unit: RelativeTimeFormatUnit, |
| 134 | + ): string; |
| 135 | + |
| 136 | + /** |
| 137 | + * A version of the format method which it returns an array of objects |
| 138 | + * which represent "parts" of the object, |
| 139 | + * separating the formatted number into its constituent parts |
| 140 | + * and separating it from other surrounding text. |
| 141 | + * These objects have two properties: |
| 142 | + * `type` a NumberFormat formatToParts type, and `value`, |
| 143 | + * which is the String which is the component of the output. |
| 144 | + * If a "part" came from NumberFormat, |
| 145 | + * it will have a unit property which indicates the `unit` being formatted; |
| 146 | + * literals which are part of the larger frame will not have this property. |
| 147 | + * |
| 148 | + * @param value - Numeric value to use in the internationalized relative time message |
| 149 | + * |
| 150 | + * @param unit - [Unit](https://tc39.es/ecma402/#sec-singularrelativetimeunit) |
| 151 | + * to use in the relative time internationalized message. |
| 152 | + * Possible values are: `"year"`, `"quarter"`, `"month"`, `"week"`, |
| 153 | + * `"day"`, `"hour"`, `"minute"`, `"second"`. |
| 154 | + * Plural forms are also permitted. |
| 155 | + * |
| 156 | + * @throws `RangeError` if `unit` was given something other than `unit` possible values |
| 157 | + * |
| 158 | + * @returns Array of [FormatRelativeTimeToParts](https://tc39.es/ecma402/#sec-FormatRelativeTimeToParts) |
| 159 | + * |
| 160 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/formatToParts). |
| 161 | + * |
| 162 | + * [Specification](https://tc39.es/ecma402/#sec-Intl.RelativeTimeFormat.prototype.formatToParts). |
| 163 | + */ |
| 164 | + formatToParts( |
| 165 | + value: number, |
| 166 | + unit: RelativeTimeFormatUnit, |
| 167 | + ): RelativeTimeFormatPart[]; |
| 168 | + |
| 169 | + /** |
| 170 | + * Provides access to the locale and options computed during initialization of this `Intl.RelativeTimeFormat` object. |
| 171 | + * |
| 172 | + * @returns A new object with properties reflecting the locale |
| 173 | + * and formatting options computed during initialization |
| 174 | + * of the `Intel.RelativeTimeFormat` object. |
| 175 | + * |
| 176 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/resolvedOptions). |
| 177 | + * |
| 178 | + * [Specification](https://tc39.es/ecma402/#sec-intl.relativetimeformat.prototype.resolvedoptions) |
| 179 | + */ |
| 180 | + resolvedOptions(): ResolvedRelativeTimeFormatOptions; |
| 181 | + } |
| 182 | + |
| 183 | + /** |
| 184 | + * The [`Intl.RelativeTimeFormat`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat) |
| 185 | + * object is a constructor for objects that enable language-sensitive relative time formatting. |
| 186 | + * |
| 187 | + * Part of [Intl object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl) |
| 188 | + * namespace and the [ECMAScript Internationalization API](https://www.ecma-international.org/publications/standards/Ecma-402.htm). |
| 189 | + * |
| 190 | + * [Compatibility](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat#Browser_compatibility). |
| 191 | + * |
| 192 | + * [Polyfills](https://github.com/tc39/proposal-intl-relative-time#polyfills). |
| 193 | + */ |
| 194 | + const RelativeTimeFormat: { |
| 195 | + /** |
| 196 | + * Constructor creates [Intl.RelativeTimeFormat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat) |
| 197 | + * objects |
| 198 | + * |
| 199 | + * @param locales - A string with a [BCP 47 language tag](http://tools.ietf.org/html/rfc5646), or an array of such strings. |
| 200 | + * For the general form and interpretation of the locales argument, |
| 201 | + * see the [`Intl` page](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl#Locale_identification_and_negotiation). |
| 202 | + * |
| 203 | + * @param options - An [object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/RelativeTimeFormat#Parameters) |
| 204 | + * with some or all of options of the formatting. |
| 205 | + * An object with some or all of the following properties: |
| 206 | + * - `localeMatcher` - The locale matching algorithm to use. |
| 207 | + * Possible values are `"lookup"` and `"best fit"`; the default is `"best fit"`. |
| 208 | + * For information about this option, see [Intl page](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl#Locale_negotiation). |
| 209 | + * - `numeric` - The format of output message. |
| 210 | + * Possible values are: `"always"` (default, e.g., `1 day ago`) or `"auto"` (e.g., `yesterday`). |
| 211 | + * The `"auto"` value allows to not always have to use numeric values in the output. |
| 212 | + * - `style` - The length of the internationalized message. Possible values are: |
| 213 | + * `"long"` (default, e.g., in 1 month), |
| 214 | + * `"short"` (e.g., in 1 mo.) |
| 215 | + * or `"narrow"` (e.g., in 1 mo.). The narrow style could be similar to the short style for some locales. |
| 216 | + * |
| 217 | + * @returns [Intl.RelativeTimeFormat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat) object. |
| 218 | + * |
| 219 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/RelativeTimeFormat). |
| 220 | + * |
| 221 | + * [Specification](https://tc39.es/ecma402/#sec-intl-relativetimeformat-constructor). |
| 222 | + */ |
| 223 | + new( |
| 224 | + locales?: BCP47LanguageTag | BCP47LanguageTag[], |
| 225 | + options?: RelativeTimeFormatOptions, |
| 226 | + ): RelativeTimeFormat; |
| 227 | + |
| 228 | + /** |
| 229 | + * Returns an array containing those of the provided locales |
| 230 | + * that are supported in date and time formatting |
| 231 | + * without having to fall back to the runtime's default locale. |
| 232 | + * |
| 233 | + * @param locales - A string with a [BCP 47 language tag](http://tools.ietf.org/html/rfc5646), or an array of such strings. |
| 234 | + * For the general form and interpretation of the locales argument, |
| 235 | + * see the [`Intl` page](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl#Locale_identification_and_negotiation). |
| 236 | + * |
| 237 | + * @param options - An [object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/RelativeTimeFormat#Parameters) |
| 238 | + * with some or all of options of the formatting. |
| 239 | + * An object with some or all of the following properties: |
| 240 | + * - `localeMatcher` - The locale matching algorithm to use. |
| 241 | + * Possible values are `"lookup"` and `"best fit"`; the default is `"best fit"`. |
| 242 | + * For information about this option, see [Intl page](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl#Locale_negotiation). |
| 243 | + * - `numeric` - The format of output message. |
| 244 | + * Possible values are: `"always"` (default, e.g., `1 day ago`) or `"auto"` (e.g., `yesterday`). |
| 245 | + * The `"auto"` value allows to not always have to use numeric values in the output. |
| 246 | + * - `style` - The length of the internationalized message. Possible values are: |
| 247 | + * `"long"` (default, e.g., in 1 month), |
| 248 | + * `"short"` (e.g., in 1 mo.) |
| 249 | + * or `"narrow"` (e.g., in 1 mo.). The narrow style could be similar to the short style for some locales. |
| 250 | + * |
| 251 | + * @returns An array containing those of the provided locales |
| 252 | + * that are supported in date and time formatting |
| 253 | + * without having to fall back to the runtime's default locale. |
| 254 | + * |
| 255 | + * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/supportedLocalesOf). |
| 256 | + * |
| 257 | + * [Specification](https://tc39.es/ecma402/#sec-Intl.RelativeTimeFormat.supportedLocalesOf). |
| 258 | + */ |
| 259 | + supportedLocalesOf( |
| 260 | + locales: BCP47LanguageTag | BCP47LanguageTag[], |
| 261 | + options?: RelativeTimeFormatOptions, |
| 262 | + ): BCP47LanguageTag[]; |
| 263 | + }; |
| 264 | +} |
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