Node.js 如何使用jq将依赖项添加到package.json中

我想使用jq将包依赖项添加到package.json文件by bash脚本中.

Add new element to existing JSON array with jq

下面是测试脚本，包含5个步骤:

#!/bin/bash

add_element_with_jq() {
    
    # step 1: Add a new root element "{}" first
    echo "============= step 1 ================"
    
    echo "{}" > "package.json"
    
    # step 2: Add a "dependencies" sub element to the root element "{}"
    echo "============= step 2 ================"
    # step 3: Add a "foo" package with version "1.1.1" to the "dependencies"
    echo "============= step 3 ================"
    
    jq '. += dependencies {
      "foo": "1.1.1"
    }' "package.json"
    
    echo "=========== step 3 output =================="
    cat "package.json"
    
    # step 4: Add a "bar" package with version "2.2.2" to the "dependencies"
    echo "============= step 4 ================"
    
    jq '.dependencies += 
      "bar": "2.2.2"
    ' "package.json"
    
    # step 5: If the "foo" package already existed, then update to the latest version. Otherwise, add the "foo" package to the dependencies.
    echo "============= step 5 ================"
    
    jq '.dependencies += 
      "foo": "3.3.3"
    ' "package.json"
    
    echo "=========== final output =================="
    cat "package.json"
}

add_element_with_jq

错误是:

============= step 1 ================
============= step 2 ================
============= step 3 ================
jq: error: syntax error, unexpected '{', expecting $end (Unix shell quoting issues?) at <top-level>, line 1:
. += dependencies {                  
jq: 1 compile error
=========== step 3 output ==================
{}
============= step 4 ================
jq: error: syntax error, unexpected ':', expecting $end (Unix shell quoting issues?) at <top-level>, line 2:
      "bar": "2.2.2"           
jq: 1 compile error
============= step 5 ================
jq: error: syntax error, unexpected ':', expecting $end (Unix shell quoting issues?) at <top-level>, line 2:
      "foo": "3.3.3"           
jq: 1 compile error
=========== final output ==================
{}

以下是预期输出:

=========== step 3 output ==================
{
  "dependencies": {
    "foo": "1.1.1"
  }
}
=========== final output ==================
{
  "dependencies": {
    "foo": "3.3.3",
    "bar": "2.2.2"
  }
}

我的bash函数出了什么问题，以及如何修复jq命令？