perf(build): override Tavily's default model name; Add separate script for full building control

scripts/build.js

@@ -0,0 +1,106 @@
+/**
+ * build.js
+ * The project uses js-tiktoken to cut down text to avoid exceeding LLM's context length.
+ * However, js-tiktoken has all encodings hard-coded into its code (node_modules/js-tiktoken/dist/index.cjs and node_modules/js-tiktoken/dist/index.js),
+ * which makes the build output quite large.
+ * 
+ * I've analyzed the import dependencies and found that the
+ * `@tavily/core` SDK also uses js-tiktoken's `cl100k_base` encoding.
+ * So basically only `cl100k_base` (for tavily) and `o200k_base` (for our project) are needed.
+ * 
+ * So I wrote this script to override the encodings in `@tavily/core` to `o200k_base`
+ * and clean up unused js-tiktoken encodings in the build output,
+ * making the build output smaller by about 2 MB.
+*/
+
+import { execSync } from 'child_process';
+import fs from 'fs';
+
+// Change Tavily SDK's js-tiktoken to use `o200k_base`
+const tavilyFilePaths = ['node_modules/@tavily/core/dist/index.js', 'node_modules/@tavily/core/dist/index.mjs'];
+const tiktokenFilePaths = ['node_modules/js-tiktoken/dist/index.cjs', 'node_modules/js-tiktoken/dist/index.js'];
+
+function cleanup() {
+  for (const filePath of tavilyFilePaths) {
+    if (fs.existsSync(filePath)) {
+      // Create a backup
+      const backupPath = filePath + '.bak';
+      fs.copyFileSync(filePath, backupPath);
+
+      let content = fs.readFileSync(filePath, 'utf-8');
+      content = content.replace(
+        `var DEFAULT_MODEL_ENCODING = "gpt-3.5-turbo"`,
+        'var DEFAULT_MODEL_ENCODING = "gpt-4o"'
+      );
+      fs.writeFileSync(filePath, content, 'utf-8');
+      console.log(`Successfully overrided Tavily SDK's js-tiktoken model name in ${filePath}`);
+    }
+  }
+  for (const filePath of tiktokenFilePaths) {
+    if (fs.existsSync(filePath)) {
+      // Create a backup
+      const backupPath = filePath + '.bak';
+      fs.copyFileSync(filePath, backupPath);
+
+      let content = fs.readFileSync(filePath, 'utf-8');
+
+      // Clear all encodings except for o200k_base
+      const patterns = [
+        ['gpt2_default', 'var gpt2_default = { "explicit_n_vocab": 50257, "pat_str":', 'var gpt2_default = {}'],
+        ['p50k_base_default', 'var p50k_base_default = { "explicit_n_vocab":', 'var p50k_base_default = {}'],
+        ['p50k_edit_default', 'var p50k_edit_default = { "pat_str":', 'var p50k_edit_default = {}'],
+        ['r50k_base_default', 'var r50k_base_default = { "explicit_n_vocab":', 'var r50k_base_default = {}'],
+        ['cl100k_base', 'var cl100k_base_default = { "pat_str":', 'var cl100k_base_default = {}'],
+      ];
+
+      for (const [name, searchStr, replaceStr] of patterns) {
+        const startIdx = content.indexOf(searchStr);
+        if (startIdx === -1) continue;
+
+        // Find the end of line
+        const endIdx = content.indexOf('\n', startIdx);
+        if (endIdx === -1) continue;
+
+        // Replace the line
+        content = content.slice(0, startIdx) + replaceStr + content.slice(endIdx);
+      }
+
+      // Write back
+      fs.writeFileSync(filePath, content, 'utf-8');
+      console.log(`Successfully cleaned up js-tiktoken encodings in ${filePath}`);
+    }
+  }
+}
+
+function restore() {
+  for (const filePath of tavilyFilePaths) {
+    if (fs.existsSync(`${filePath}.bak`)) {
+      console.log(`Restoring Tavily SDK's js-tiktoken encodings in ${filePath}`);
+      fs.renameSync(`${filePath}.bak`, filePath);
+    }
+  }
+
+  for (const filePath of tiktokenFilePaths) {
+    if (fs.existsSync(`${filePath}.bak`)) {
+      console.log(`Restoring js-tiktoken encodings in ${filePath}`);
+      fs.renameSync(`${filePath}.bak`, filePath);
+    }
+  }
+}
+
+function build() {
+  try {
+    let command = 'build'
+    if (process.argv.includes('--generate')) {
+      command = 'generate'
+    }
+    cleanup()
+    execSync(`pnpm ${command}`, { stdio: 'inherit' })
+  } catch (error) {
+    console.error(error)
+  } finally {
+    restore()
+  }
+}
+
+build()