variable in makefile in javascript

To declare and use variables in Makefile with JavaScript, you can use the $(shell ...) function to run a command that executes your JavaScript code and returns the result.

Here's an example:

# Declare a variable
MY_VARIABLE := $(shell node -p "const myVar = 123; myVar")

# Use the variable
all:
    @echo "My variable is: $(MY_VARIABLE)"
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In the above example, the MY_VARIABLE variable is declared using the $(shell ...) function, which runs the node command to execute the JavaScript code that defines the variable. The result of this command is then assigned to the MY_VARIABLE make variable.

You can then use the $(MY_VARIABLE) variable in your make targets as needed. In this example, we echo the value of the variable using the @echo command in the all target.

Note that you can include any valid JavaScript code inside the node -p "..." command. This makes it easy to perform more complex calculations or operations to set your make variables.