export class NoSuchDeclarationError extends Error {
}
function isExportDeclaration(node) {
    return node.type === "ExportDeclaration";
}
function isVariableDeclaration(node) {
    return node.type === "VariableDeclaration";
}
function isIdentifier(node) {
    return node.type === "Identifier";
}
function isBooleanLiteral(node) {
    return node.type === "BooleanLiteral";
}
function isNullLiteral(node) {
    return node.type === "NullLiteral";
}
function isStringLiteral(node) {
    return node.type === "StringLiteral";
}
function isNumericLiteral(node) {
    return node.type === "NumericLiteral";
}
function isArrayExpression(node) {
    return node.type === "ArrayExpression";
}
function isObjectExpression(node) {
    return node.type === "ObjectExpression";
}
function isKeyValueProperty(node) {
    return node.type === "KeyValueProperty";
}
function isRegExpLiteral(node) {
    return node.type === "RegExpLiteral";
}
function isTemplateLiteral(node) {
    return node.type === "TemplateLiteral";
}
export class UnsupportedValueError extends Error {
    constructor(message, paths){
        super(message);
        // Generating "path" that looks like "config.runtime[0].value"
        let codePath;
        if (paths) {
            codePath = "";
            for (const path of paths){
                if (path[0] === "[") {
                    // "array" + "[0]"
                    codePath += path;
                } else {
                    if (codePath === "") {
                        codePath = path;
                    } else {
                        // "object" + ".key"
                        codePath += `.${path}`;
                    }
                }
            }
        }
        this.path = codePath;
    }
}
function extractValue(node, path) {
    if (isNullLiteral(node)) {
        return null;
    } else if (isBooleanLiteral(node)) {
        // e.g. true / false
        return node.value;
    } else if (isStringLiteral(node)) {
        // e.g. "abc"
        return node.value;
    } else if (isNumericLiteral(node)) {
        // e.g. 123
        return node.value;
    } else if (isRegExpLiteral(node)) {
        // e.g. /abc/i
        return new RegExp(node.pattern, node.flags);
    } else if (isIdentifier(node)) {
        switch(node.value){
            case "undefined":
                return undefined;
            default:
                throw new UnsupportedValueError(`Unknown identifier "${node.value}"`, path);
        }
    } else if (isArrayExpression(node)) {
        // e.g. [1, 2, 3]
        const arr = [];
        for(let i = 0, len = node.elements.length; i < len; i++){
            const elem = node.elements[i];
            if (elem) {
                if (elem.spread) {
                    // e.g. [ ...a ]
                    throw new UnsupportedValueError("Unsupported spread operator in the Array Expression", path);
                }
                arr.push(extractValue(elem.expression, path && [
                    ...path,
                    `[${i}]`
                ]));
            } else {
                // e.g. [1, , 2]
                //         ^^
                arr.push(undefined);
            }
        }
        return arr;
    } else if (isObjectExpression(node)) {
        // e.g. { a: 1, b: 2 }
        const obj = {};
        for (const prop of node.properties){
            if (!isKeyValueProperty(prop)) {
                // e.g. { ...a }
                throw new UnsupportedValueError("Unsupported spread operator in the Object Expression", path);
            }
            let key;
            if (isIdentifier(prop.key)) {
                // e.g. { a: 1, b: 2 }
                key = prop.key.value;
            } else if (isStringLiteral(prop.key)) {
                // e.g. { "a": 1, "b": 2 }
                key = prop.key.value;
            } else {
                throw new UnsupportedValueError(`Unsupported key type "${prop.key.type}" in the Object Expression`, path);
            }
            obj[key] = extractValue(prop.value, path && [
                ...path,
                key
            ]);
        }
        return obj;
    } else if (isTemplateLiteral(node)) {
        // e.g. `abc`
        if (node.expressions.length !== 0) {
            // TODO: should we add support for `${'e'}d${'g'}'e'`?
            throw new UnsupportedValueError("Unsupported template literal with expressions", path);
        }
        // When TemplateLiteral has 0 expressions, the length of quasis is always 1.
        // Because when parsing TemplateLiteral, the parser yields the first quasi,
        // then the first expression, then the next quasi, then the next expression, etc.,
        // until the last quasi.
        // Thus if there is no expression, the parser ends at the frst and also last quasis
        //
        // A "cooked" interpretation where backslashes have special meaning, while a
        // "raw" interpretation where backslashes do not have special meaning
        // https://exploringjs.com/impatient-js/ch_template-literals.html#template-strings-cooked-vs-raw
        const [{ cooked , raw  }] = node.quasis;
        return cooked ?? raw;
    } else {
        throw new UnsupportedValueError(`Unsupported node type "${node.type}"`, path);
    }
}
/**
 * Extracts the value of an exported const variable named `exportedName`
 * (e.g. "export const config = { runtime: 'edge' }") from swc's AST.
 * The value must be one of (or throws UnsupportedValueError):
 *   - string
 *   - boolean
 *   - number
 *   - null
 *   - undefined
 *   - array containing values listed in this list
 *   - object containing values listed in this list
 *
 * Throws NoSuchDeclarationError if the declaration is not found.
 */ export function extractExportedConstValue(module, exportedName) {
    for (const moduleItem of module.body){
        if (!isExportDeclaration(moduleItem)) {
            continue;
        }
        const declaration = moduleItem.declaration;
        if (!isVariableDeclaration(declaration)) {
            continue;
        }
        if (declaration.kind !== "const") {
            continue;
        }
        for (const decl of declaration.declarations){
            if (isIdentifier(decl.id) && decl.id.value === exportedName && decl.init) {
                return extractValue(decl.init, [
                    exportedName
                ]);
            }
        }
    }
    throw new NoSuchDeclarationError();
}

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