append(parameters.toDeclarationString())
        append("): ")
        append(returnType.toTypeArgumentString())
        appendReproducibleNewLine(" =")
        appendReproducibleNewLine("`$name`(${parameters.toArgumentsString()})".prependIndent())
        appendReproducibleNewLine()
    }.toString()

    private
    fun String.appendOrNull(s: String?) =
        if (s == null) null else "$this$s"

) {
    file.bufferedWriter().use { writer ->
        writer.appendReproducibleNewLine(fileHeader)
        pluginIdExtensionDeclarationsFor(
            gradleJars,
            pluginDependenciesSpecQualifiedName,
            pluginDependencySpecQualifiedName
        ).forEach { extension ->
            writer.write("\n")
            writer.appendReproducibleNewLine(extension)
        }
    }
}


private

/**
 * Appends value to the given Appendable and simple `\n` line separator after it.
 *
 * Always using the same line separator on all systems to allow for reproducible outputs.
 */
fun Appendable.appendReproducibleNewLine(value: CharSequence = ""): Appendable {
    assert('\r' !in value) {
        "Unexpected line ending in string."
    }
    return append(value).append("\n")