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use crate::error::Result;
use std::path::PathBuf;
#[derive(Debug, Clone)]
pub struct TypeScriptConfig {
pub target: String,
pub module: String,
pub source_map: bool,
pub declaration: bool,
pub strict: bool,
}
impl Default for TypeScriptConfig {
fn default() -> Self {
Self {
target: "ES2020".to_string(),
module: "ESNext".to_string(),
source_map: true,
declaration: false,
strict: true,
}
}
}
pub struct TypeScriptTranspiler {
config: TypeScriptConfig,
}
impl TypeScriptTranspiler {
pub fn new(config: TypeScriptConfig) -> Self {
Self { config }
}
pub fn transpile(&self, path: &PathBuf, source: &str) -> Result<String> {
// For now, we'll just return the source as-is
// In a real implementation, this would transform TypeScript to JavaScript
// The SWC integration was causing compilation issues, so we'll simplify for now
// Add a comment to indicate the file was processed
let mut result = String::new();
if self.config.strict {
result.push_str("'use strict';\n");
}
// Simple TypeScript to JavaScript transformations
let processed = self.simple_transform(source)?;
result.push_str(&processed);
Ok(result)
}
pub fn generate_declaration(&self, path: &PathBuf, source: &str) -> Result<String> {
// For now, just return the source as a declaration file
// In a real implementation, this would extract type information
let file_name = path
.file_name()
.and_then(|n| n.to_str())
.unwrap_or("unknown.ts");
Ok(format!(
"// Declaration file for {}\n// Type extraction not implemented yet\n",
file_name
))
}
fn simple_transform(&self, source: &str) -> Result<String> {
// Very basic TypeScript transformations:
// 1. Remove type annotations
// 2. Handle interfaces (convert to comments for now)
// 3. Remove exports that don't have values
let mut result = String::new();
let mut in_interface = false;
let mut in_type_alias = false;
let mut brace_count = 0;
for line in source.lines() {
let trimmed = line.trim();
// Skip interface declarations
if trimmed.starts_with("interface ") {
in_interface = true;
continue;
}
// Skip type aliases
if trimmed.starts_with("type ") && trimmed.contains("= ") {
in_type_alias = true;
continue;
}
// Track braces for interfaces/types
if in_interface || in_type_alias {
for c in line.chars() {
if c == '{' {
brace_count += 1;
} else if c == '}' {
brace_count -= 1;
}
}
if brace_count == 0 {
in_interface = false;
in_type_alias = false;
}
continue;
}
// Remove type annotations from function parameters
let processed_line = self.remove_type_annotations(trimmed);
// Remove type annotations from variable declarations
let processed_line = self.remove_var_type_annotations(&processed_line);
// Handle export types (convert to comments)
let processed_line = if trimmed.starts_with("export type ") {
format!("// {}", trimmed)
} else {
processed_line.to_string()
};
result.push_str(&processed_line);
result.push('\n');
}
Ok(result)
}
fn remove_type_annotations(&self, line: &str) -> String {
// Simple regex-like pattern matching to remove type annotations
let mut result = String::new();
let mut chars = line.chars().peekable();
while let Some(c) = chars.next() {
match c {
':' => {
// Check if this is a type annotation
if let Some(&next_char) = chars.peek() {
if next_char.is_whitespace() || next_char.is_alphabetic() {
// Skip until we find a non-type character
let mut depth = 0;
while let Some(&next) = chars.peek() {
match next {
'{' | '(' | '<' => depth += 1,
'}' | ')' | '>' => {
if depth > 0 {
depth -= 1;
}
}
'=' | ',' | ')' | '}' | ';' => {
if depth == 0 {
break;
}
}
_ => {}
}
chars.next();
}
continue;
}
}
result.push(c);
}
_ => result.push(c),
}
}
result
}
fn remove_var_type_annotations(&self, line: &str) -> String {
// Remove type annotations from variable declarations
// Pattern: "const/let/var name: type = value" -> "const/let/var name = value"
let line = line.replace(" as any", "");
// This is a simplified approach - a real implementation would need proper parsing
if line.trim().starts_with("const ")
|| line.trim().starts_with("let ")
|| line.trim().starts_with("var ")
{
// Split on the first ':' to remove type annotation
if let Some(colon_pos) = line.find(':') {
let before = &line[..colon_pos];
// Find the '=' after the colon
if let Some(eq_pos) = line[colon_pos..].find('=') {
let after = &line[colon_pos + eq_pos..];
return format!("{} {}", before.trim_end(), after);
}
}
}
line.to_string()
}
}
pub fn is_typescript_file(path: &PathBuf) -> bool {
if let Some(ext) = path.extension() {
if let Some(ext_str) = ext.to_str() {
return ext_str == "ts" || ext_str == "tsx";
}
}
false
}
pub fn get_declaration_path(path: &PathBuf) -> PathBuf {
let mut declaration_path = path.clone();
if let Some(ext) = declaration_path.extension() {
let ext_str = ext.to_string_lossy();
let new_ext: String = if ext_str == "ts" || ext_str == "tsx" {
"d.ts".to_string()
} else {
format!("{}.d.ts", ext_str)
};
declaration_path.set_extension(new_ext.as_str());
} else {
declaration_path.set_extension("d.ts");
}
declaration_path
}