Function goDiscriminatorMethodName

scripts/codegen/go.ts:1734–1762

(
    typeName: string,
    discriminatorProp: string,
    discGoName: string,
    variants: GoDiscriminatedUnionVariant[],
    ctx: GoCodegenCtx
)

}

function goDiscriminatorMethodName(
    typeName: string,
    discriminatorProp: string,
    discGoName: string,
    variants: GoDiscriminatedUnionVariant[],
    ctx: GoCodegenCtx
): string {
    const collidesWithVariantField = variants.some((variant) => {
        const resolved = resolveSchema(variant.schema, ctx.definitions) ?? variant.schema;
        const objectSchema = resolveObjectSchema(resolved, ctx.definitions) ?? resolved;
        const variantPreExisting = ctx.generatedNames.has(variant.typeName);
        return Object.keys(objectSchema.properties ?? {}).some((propName) => {
            const propGoName = toGoFieldName(propName);
            if (propName === discriminatorProp) {
                // The flat-union variant emission elides single-value discriminators
                // and renames multi-value ones to ``Discriminator``, so a natural-name
                // collision is only possible when the variant struct is a pre-existing
                // type (already in ``ctx.generatedNames``) that retained the discriminator
                // as a struct field with its natural Go name. The ``Discriminator``-rename
                // collision case is independent and detected by the second clause.
                return (variantPreExisting && propGoName === discGoName)
                    || (variant.discriminatorValues.length > 1 && discGoName === "Discriminator");
            }
            return propGoName === discGoName;
        });
    });

    return collidesWithVariantField ? `${toGoUnexportedIdentifier(typeName)}${discGoName}` : discGoName;
}

/**
 * Emit a Go interface for a discriminated union (anyOf with const discriminator).