export type ExpressionSource = {
    readonly id: string;
};
/** Values that can appear in ternary `.then()` / `.else()` branches. */
export type TernaryValue = string | number | boolean | ExpressionValue;
/**
 * An expression that resolves to a value inside a GitHub Actions workflow.
 * Supports fluent comparison methods that produce Conditions.
 */
export declare class ExpressionValue {
    #private;
    readonly source: ExpressionSource | undefined;
    constructor(expression: string, source?: ExpressionSource | ReadonlySet<ExpressionSource>);
    /** all expression sources referenced by this value */
    get allSources(): ReadonlySet<ExpressionSource>;
    /** raw expression text without `${{ }}` wrapping */
    get expression(): string;
    equals(value: string | number | boolean): Condition;
    notEquals(value: string | number | boolean): Condition;
    startsWith(prefix: string): Condition;
    contains(substring: string): Condition;
    not(): Condition;
    /** concatenate this value with additional strings, numbers, or expressions */
    concat(...parts: ConcatPart[]): ExpressionValue;
    endsWith(suffix: string): Condition;
    greaterThan(value: number): Condition;
    greaterThanOrEqual(value: number): Condition;
    lessThan(value: number): Condition;
    lessThanOrEqual(value: number): Condition;
    /** serialize this value as JSON */
    toJSON(): ExpressionValue;
    /** wrap in `${{ }}` for use in YAML */
    toString(): string;
}
/**
 * A boolean condition used in `if` fields. Supports fluent `.and()`, `.or()`,
 * `.not()` composition. Tracks all ExpressionSources referenced so that
 * dependencies can be inferred automatically.
 */
export declare abstract class Condition {
    readonly sources: ReadonlySet<ExpressionSource>;
    constructor(sources: ReadonlySet<ExpressionSource>);
    and(other: Condition | boolean): Condition;
    or(other: Condition | boolean): Condition;
    not(): Condition;
    /**
     * Starts a ternary expression: `condition && trueValue || falseValue`.
     *
     * ```ts
     * const runner = os.equals("linux").then("ubuntu-latest").else("macos-latest");
     * // => matrix.os == 'linux' && 'ubuntu-latest' || 'macos-latest'
     * ```
     */
    then(value: TernaryValue): ThenBuilder;
    /**
     * Returns the flat AND terms of this condition. Used by condition
     * simplification to detect absorption (A || A && B → A).
     */
    getAndTerms(): string[];
    /** returns the flat AND children of this condition as Condition objects */
    flattenAnd(): Condition[];
    /** returns the flat OR children of this condition as Condition objects */
    flattenOr(): Condition[];
    /** returns true if this condition always evaluates to true */
    isAlwaysTrue(): boolean;
    /** returns true if this condition always evaluates to false */
    isAlwaysFalse(): boolean;
    /** returns true if this condition could possibly evaluate to true */
    isPossiblyTrue(): boolean;
    /** render without `${{ }}` wrapping */
    abstract toExpression(): string;
    /** render wrapped in `${{ }}` for YAML `if` fields */
    toString(): string;
}
/** comparison operators supported in GitHub Actions expressions */
export type ComparisonOp = "==" | "!=" | ">" | ">=" | "<" | "<=";
/** `left op right` where op is ==, !=, >, >=, <, or <= */
export declare class ComparisonCondition extends Condition {
    #private;
    constructor(left: string, op: ComparisonOp, right: string | number | boolean, sources: ReadonlySet<ExpressionSource>);
    not(): Condition;
    toExpression(): string;
}
/** `fn(arg1, arg2, ...)` */
export declare class FunctionCallCondition extends Condition {
    #private;
    constructor(fn: string, args: string[], sources: ReadonlySet<ExpressionSource>);
    toExpression(): string;
}
/** wraps a raw expression string as a Condition */
export declare class RawCondition extends Condition {
    #private;
    constructor(expression: string, sources: ReadonlySet<ExpressionSource>);
    isAlwaysTrue(): boolean;
    isAlwaysFalse(): boolean;
    not(): Condition;
    toExpression(): string;
}
/** Creates an ExpressionValue from a raw expression string. */
export declare function expr(expression: string): ExpressionValue;
/** Common condition helpers for GitHub Actions workflows. */
export declare const conditions: {
    /** A condition that is always true. Simplifies away in `.and()` / `.or()`. */
    readonly isTrue: () => Condition;
    /** A condition that is always false. Simplifies away in `.and()` / `.or()`. */
    readonly isFalse: () => Condition;
    /** Status check functions for use in step/job `if` fields. */
    readonly status: {
        /** Run regardless of previous step outcome. */
        readonly always: () => Condition;
        /** Run only when all previous steps succeeded (default behavior). */
        readonly success: () => Condition;
        /** Run only when a previous step has failed. */
        readonly failure: () => Condition;
        /** Run only when the workflow was cancelled. */
        readonly cancelled: () => Condition;
    };
    /**
     * Check if the ref is a tag. Without arguments, matches any tag.
     * With a tag name, matches that specific tag.
     *
     * ```ts
     * conditions.isTag()          // startsWith(github.ref, 'refs/tags/')
     * conditions.isTag("v1.0.0")  // github.ref == 'refs/tags/v1.0.0'
     * ```
     */
    readonly isTag: (tag?: string) => Condition;
    /**
     * Check if the ref is a specific branch.
     *
     * ```ts
     * conditions.isBranch("main")  // github.ref == 'refs/heads/main'
     * ```
     */
    readonly isBranch: (branch: string) => Condition;
    /**
     * Check the event that triggered the workflow.
     *
     * ```ts
     * conditions.isEvent("pull_request")  // github.event_name == 'pull_request'
     * ```
     */
    readonly isEvent: (event: string) => Condition;
    /**
     * Check if the event is a pull request.
     *
     * ```ts
     * conditions.isPr()  // github.event_name == 'pull_request'
     * ```
     */
    readonly isPr: () => Condition;
    /**
     * Check the repository (owner/name).
     *
     * ```ts
     * conditions.isRepository("denoland/deno")  // github.repository == 'denoland/deno'
     * ```
     */
    readonly isRepository: (repo: string) => Condition;
    /**
     * Check if the pull request is a draft.
     *
     * ```ts
     * conditions.isDraftPr()  // github.event.pull_request.draft == true
     * ```
     */
    readonly isDraftPr: () => Condition;
    /**
     * Check if the pull request has a specific label.
     *
     * ```ts
     * conditions.hasLabel("ci-full")  // contains(github.event.pull_request.labels.*.name, 'ci-full')
     * ```
     */
    readonly hasPrLabel: (label: string) => Condition;
    /**
     * Check the runner operating system.
     *
     * ```ts
     * conditions.isRunnerOs("Linux")    // runner.os == 'Linux'
     * conditions.isRunnerOs("macOS")    // runner.os == 'macOS'
     * conditions.isRunnerOs("Windows")  // runner.os == 'Windows'
     * ```
     */
    readonly isRunnerOs: (os: "Linux" | "macOS" | "Windows") => Condition;
    /**
     * Check the runner architecture.
     *
     * ```ts
     * conditions.isRunnerArch("X86")    // runner.arch == 'X86'
     * conditions.isRunnerArch("X64")    // runner.arch == 'X64'
     * conditions.isRunnerArch("ARM")    // runner.arch == 'ARM'
     * conditions.isRunnerArch("ARM64")  // runner.arch == 'ARM64'
     * ```
     */
    readonly isRunnerArch: (arch: "X86" | "X64" | "ARM" | "ARM64") => Condition;
};
/** Checks if a condition-like value always evaluates to true. */
export declare function isAlwaysTrue(c: Condition | ExpressionValue | string): boolean;
/** Checks if a condition-like value always evaluates to false. */
export declare function isAlwaysFalse(c: Condition | ExpressionValue | string): boolean;
export declare function formatLiteral(value: string | number | boolean): string;
export declare function sourcesFrom(...sourceables: ({
    source?: ExpressionSource;
} | Condition)[]): ReadonlySet<ExpressionSource>;
interface TernaryBranch {
    condition: Condition;
    value: TernaryValue;
}
/**
 * Intermediate builder after `.then(value)`. Call `.else()` to produce the
 * final `ExpressionValue`, or `.elseIf()` to add another branch.
 */
export declare class ThenBuilder {
    #private;
    constructor(branches: TernaryBranch[], sources: ReadonlySet<ExpressionSource>);
    /** Add another conditional branch. */
    elseIf(condition: Condition): ElseIfBuilder;
    /**
     * Finalize the ternary with a default value.
     *
     * ```ts
     * os.equals("linux").then("ubuntu-latest").else("macos-latest")
     * // => matrix.os == 'linux' && 'ubuntu-latest' || 'macos-latest'
     * ```
     */
    else(value: TernaryValue): ExpressionValue;
}
/**
 * Intermediate builder after `.elseIf(condition)`. Call `.then()` to provide
 * the value for this branch.
 */
export declare class ElseIfBuilder {
    #private;
    constructor(branches: TernaryBranch[], sources: Set<ExpressionSource>, condition: Condition);
    /** Provide the value for this branch. */
    then(value: TernaryValue): ThenBuilder;
}
/** a part of a concatenation: plain string, number, or expression */
export type ConcatPart = string | number | ExpressionValue;
/**
 * Concatenates strings, numbers, and expressions into a single value.
 * Expression parts are wrapped in `${{ }}` when serialized for YAML,
 * and use the `format()` function when used inside expression contexts.
 *
 * ```ts
 * const name = concat("build-", expr("matrix.os"));
 * name.toString()  // => "build-${{ matrix.os }}"
 * name.expression  // => "format('build-{0}', matrix.os)"
 *
 * const full = concat("build-", expr("matrix.os"), "-", expr("matrix.arch"));
 * full.toString()  // => "build-${{ matrix.os }}-${{ matrix.arch }}"
 * ```
 */
export declare function concat(...parts: ConcatPart[]): ExpressionValue;
/**
 * Parses a JSON string into an object/value. Wraps in `fromJSON()` in GitHub
 * Actions expression contexts.
 *
 * ```ts
 * const matrix = fromJSON(expr("needs.setup.outputs.matrix"));
 * matrix.toString()  // => "${{ fromJSON(needs.setup.outputs.matrix) }}"
 * ```
 */
export declare function fromJSON(value: string | ExpressionValue): ExpressionValue;
/**
 * Serializes a value to JSON. Wraps in `toJSON()` in GitHub Actions expression
 * contexts.
 *
 * ```ts
 * const json = toJSON(expr("github.event"));
 * json.toString()  // => "${{ toJSON(github.event) }}"
 * ```
 */
export declare function toJSON(value: ExpressionValue): ExpressionValue;
/** Computes a hash of files matching the given glob patterns. */
export declare function hashFiles(...patterns: (string | ExpressionValue)[]): ExpressionValue;
/**
 * Joins an array expression with an optional separator. Wraps in `join()` in
 * GitHub Actions expression contexts.
 *
 * ```ts
 * const labels = join(expr("github.event.pull_request.labels.*.name"), ", ");
 * labels.toString()  // => "${{ join(github.event.pull_request.labels.*.name, ', ') }}"
 * ```
 */
export declare function join(value: ExpressionValue, separator?: string): ExpressionValue;
/** Creates an ExpressionValue or Condition from a literal value. */
export declare function literal(value: boolean): Condition;
export declare function literal(value: string | number): ExpressionValue;
/** Maps a property type to Condition (for booleans/conditions) or ExpressionValue (for values). */
export type ExprOf<T> = [T] extends [boolean | Condition] ? Condition : ExpressionValue;
/** Maps all properties of an object to their expression/condition form. */
export type ExprMap<T extends Record<string, unknown>> = {
    readonly [K in keyof T & string]: ExprOf<T[K]>;
};
/**
 * Converts an object with plain values into an object with typed
 * Condition/ExpressionValue properties. Booleans become Conditions,
 * strings/numbers become ExpressionValues that serialize inline.
 */
export declare function defineExprObj<const T extends Record<string, unknown>>(obj: T): ExprMap<T>;
export {};
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