Unicode MessageFormat for JavaScript
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    Used to represent runtime/formatting errors.

    interface MessageFallback {
        dir?: "ltr" | "rtl" | "auto";
        options?: object;
        selectKey?: (keys: Set<string>) => null | string;
        source: string;
        type: "fallback";
        valueOf?: () => unknown;
        toParts(): [MessageFallbackPart];
        toString(): string;
    }

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    Properties

    dir?: "ltr" | "rtl" | "auto"
    options?: object
    selectKey?: (keys: Set<string>) => null | string
    source: string
    type: "fallback"
    valueOf?: () => unknown

    Methods